--- a/web/wp-includes/media.php Tue Feb 02 14:45:47 2010 +0000
+++ b/web/wp-includes/media.php Tue Feb 02 15:44:16 2010 +0000
@@ -1,796 +1,1303 @@
-<?php
-/**
- * WordPress API for media display.
- *
- * @package WordPress
- */
-
-/**
- * Scale down the default size of an image.
- *
- * This is so that the image is a better fit for the editor and theme.
- *
- * The $size parameter accepts either an array or a string. The supported string
- * values are 'thumb' or 'thumbnail' for the given thumbnail size or defaults at
- * 128 width and 96 height in pixels. Also supported for the string value is
- * 'medium' and 'full'. The 'full' isn't actually supported, but any value other
- * than the supported will result in the content_width size or 500 if that is
- * not set.
- *
- * Finally, there is a filter named, 'editor_max_image_size' that will be called
- * on the calculated array for width and height, respectively. The second
- * parameter will be the value that was in the $size parameter. The returned
- * type for the hook is an array with the width as the first element and the
- * height as the second element.
- *
- * @since 2.5.0
- * @uses wp_constrain_dimensions() This function passes the widths and the heights.
- *
- * @param int $width Width of the image
- * @param int $height Height of the image
- * @param string|array $size Size of what the result image should be.
- * @return array Width and height of what the result image should resize to.
- */
-function image_constrain_size_for_editor($width, $height, $size = 'medium') {
- global $content_width;
-
- if ( is_array($size) ) {
- $max_width = $size[0];
- $max_height = $size[1];
- }
- elseif ( $size == 'thumb' || $size == 'thumbnail' ) {
- $max_width = intval(get_option('thumbnail_size_w'));
- $max_height = intval(get_option('thumbnail_size_h'));
- // last chance thumbnail size defaults
- if ( !$max_width && !$max_height ) {
- $max_width = 128;
- $max_height = 96;
- }
- }
- elseif ( $size == 'medium' ) {
- $max_width = intval(get_option('medium_size_w'));
- $max_height = intval(get_option('medium_size_h'));
- // if no width is set, default to the theme content width if available
- }
- elseif ( $size == 'large' ) {
- // we're inserting a large size image into the editor. if it's a really
- // big image we'll scale it down to fit reasonably within the editor
- // itself, and within the theme's content width if it's known. the user
- // can resize it in the editor if they wish.
- $max_width = intval(get_option('large_size_w'));
- $max_height = intval(get_option('large_size_h'));
- if ( intval($content_width) > 0 )
- $max_width = min( intval($content_width), $max_width );
- }
- // $size == 'full' has no constraint
- else {
- $max_width = $width;
- $max_height = $height;
- }
-
- list( $max_width, $max_height ) = apply_filters( 'editor_max_image_size', array( $max_width, $max_height ), $size );
-
- return wp_constrain_dimensions( $width, $height, $max_width, $max_height );
-}
-
-/**
- * Retrieve width and height attributes using given width and height values.
- *
- * Both attributes are required in the sense that both parameters must have a
- * value, but are optional in that if you set them to false or null, then they
- * will not be added to the returned string.
- *
- * You can set the value using a string, but it will only take numeric values.
- * If you wish to put 'px' after the numbers, then it will be stripped out of
- * the return.
- *
- * @since 2.5.0
- *
- * @param int|string $width Optional. Width attribute value.
- * @param int|string $height Optional. Height attribute value.
- * @return string HTML attributes for width and, or height.
- */
-function image_hwstring($width, $height) {
- $out = '';
- if ($width)
- $out .= 'width="'.intval($width).'" ';
- if ($height)
- $out .= 'height="'.intval($height).'" ';
- return $out;
-}
-
-/**
- * Scale an image to fit a particular size (such as 'thumb' or 'medium').
- *
- * Array with image url, width, height, and whether is intermediate size, in
- * that order is returned on success is returned. $is_intermediate is true if
- * $url is a resized image, false if it is the original.
- *
- * The URL might be the original image, or it might be a resized version. This
- * function won't create a new resized copy, it will just return an already
- * resized one if it exists.
- *
- * A plugin may use the 'image_downsize' filter to hook into and offer image
- * resizing services for images. The hook must return an array with the same
- * elements that are returned in the function. The first element being the URL
- * to the new image that was resized.
- *
- * @since 2.5.0
- * @uses apply_filters() Calls 'image_downsize' on $id and $size to provide
- * resize services.
- *
- * @param int $id Attachment ID for image.
- * @param string $size Optional, default is 'medium'. Size of image, can be 'thumbnail'.
- * @return bool|array False on failure, array on success.
- */
-function image_downsize($id, $size = 'medium') {
-
- if ( !wp_attachment_is_image($id) )
- return false;
-
- $img_url = wp_get_attachment_url($id);
- $meta = wp_get_attachment_metadata($id);
- $width = $height = 0;
- $is_intermediate = false;
-
- // plugins can use this to provide resize services
- if ( $out = apply_filters('image_downsize', false, $id, $size) )
- return $out;
-
- // try for a new style intermediate size
- if ( $intermediate = image_get_intermediate_size($id, $size) ) {
- $img_url = str_replace(basename($img_url), $intermediate['file'], $img_url);
- $width = $intermediate['width'];
- $height = $intermediate['height'];
- $is_intermediate = true;
- }
- elseif ( $size == 'thumbnail' ) {
- // fall back to the old thumbnail
- if ( ($thumb_file = wp_get_attachment_thumb_file($id)) && $info = getimagesize($thumb_file) ) {
- $img_url = str_replace(basename($img_url), basename($thumb_file), $img_url);
- $width = $info[0];
- $height = $info[1];
- $is_intermediate = true;
- }
- }
- if ( !$width && !$height && isset($meta['width'], $meta['height']) ) {
- // any other type: use the real image
- $width = $meta['width'];
- $height = $meta['height'];
- }
-
- if ( $img_url) {
- // we have the actual image size, but might need to further constrain it if content_width is narrower
- list( $width, $height ) = image_constrain_size_for_editor( $width, $height, $size );
-
- return array( $img_url, $width, $height, $is_intermediate );
- }
- return false;
-
-}
-
-/**
- * An <img src /> tag for an image attachment, scaling it down if requested.
- *
- * The filter 'get_image_tag_class' allows for changing the class name for the
- * image without having to use regular expressions on the HTML content. The
- * parameters are: what WordPress will use for the class, the Attachment ID,
- * image align value, and the size the image should be.
- *
- * The second filter 'get_image_tag' has the HTML content, which can then be
- * further manipulated by a plugin to change all attribute values and even HTML
- * content.
- *
- * @since 2.5.0
- *
- * @uses apply_filters() The 'get_image_tag_class' filter is the IMG element
- * class attribute.
- * @uses apply_filters() The 'get_image_tag' filter is the full IMG element with
- * all attributes.
- *
- * @param int $id Attachment ID.
- * @param string $alt Image Description for the alt attribute.
- * @param string $title Image Description for the title attribute.
- * @param string $align Part of the class name for aligning the image.
- * @param string $size Optional. Default is 'medium'.
- * @return string HTML IMG element for given image attachment
- */
-function get_image_tag($id, $alt, $title, $align, $size='medium') {
-
- list( $img_src, $width, $height ) = image_downsize($id, $size);
- $hwstring = image_hwstring($width, $height);
-
- $class = 'align' . esc_attr($align) .' size-' . esc_attr($size) . ' wp-image-' . $id;
- $class = apply_filters('get_image_tag_class', $class, $id, $align, $size);
-
- $html = '<img src="' . esc_attr($img_src) . '" alt="' . esc_attr($alt) . '" title="' . esc_attr($title).'" '.$hwstring.'class="'.$class.'" />';
-
- $html = apply_filters( 'get_image_tag', $html, $id, $alt, $title, $align, $size );
-
- return $html;
-}
-
-/**
- * Calculates the new dimentions for a downsampled image.
- *
- * Same as {@link wp_shrink_dimensions()}, except the max parameters are
- * optional. If either width or height are empty, no constraint is applied on
- * that dimension.
- *
- * @since 2.5.0
- *
- * @param int $current_width Current width of the image.
- * @param int $current_height Current height of the image.
- * @param int $max_width Optional. Maximum wanted width.
- * @param int $max_height Optional. Maximum wanted height.
- * @return array First item is the width, the second item is the height.
- */
-function wp_constrain_dimensions( $current_width, $current_height, $max_width=0, $max_height=0 ) {
- if ( !$max_width and !$max_height )
- return array( $current_width, $current_height );
-
- $width_ratio = $height_ratio = 1.0;
-
- if ( $max_width > 0 && $current_width > 0 && $current_width > $max_width )
- $width_ratio = $max_width / $current_width;
-
- if ( $max_height > 0 && $current_height > 0 && $current_height > $max_height )
- $height_ratio = $max_height / $current_height;
-
- // the smaller ratio is the one we need to fit it to the constraining box
- $ratio = min( $width_ratio, $height_ratio );
-
- return array( intval($current_width * $ratio), intval($current_height * $ratio) );
-}
-
-/**
- * Retrieve calculated resized dimensions for use in imagecopyresampled().
- *
- * Calculate dimensions and coordinates for a resized image that fits within a
- * specified width and height. If $crop is true, the largest matching central
- * portion of the image will be cropped out and resized to the required size.
- *
- * @since 2.5.0
- *
- * @param int $orig_w Original width.
- * @param int $orig_h Original height.
- * @param int $dest_w New width.
- * @param int $dest_h New height.
- * @param bool $crop Optional, default is false. Whether to crop image or resize.
- * @return bool|array False, on failure. Returned array matches parameters for imagecopyresampled() PHP function.
- */
-function image_resize_dimensions($orig_w, $orig_h, $dest_w, $dest_h, $crop=false) {
-
- if ($orig_w <= 0 || $orig_h <= 0)
- return false;
- // at least one of dest_w or dest_h must be specific
- if ($dest_w <= 0 && $dest_h <= 0)
- return false;
-
- if ( $crop ) {
- // crop the largest possible portion of the original image that we can size to $dest_w x $dest_h
- $aspect_ratio = $orig_w / $orig_h;
- $new_w = min($dest_w, $orig_w);
- $new_h = min($dest_h, $orig_h);
- if (!$new_w) {
- $new_w = intval($new_h * $aspect_ratio);
- }
- if (!$new_h) {
- $new_h = intval($new_w / $aspect_ratio);
- }
-
- $size_ratio = max($new_w / $orig_w, $new_h / $orig_h);
-
- $crop_w = ceil($new_w / $size_ratio);
- $crop_h = ceil($new_h / $size_ratio);
-
- $s_x = floor(($orig_w - $crop_w)/2);
- $s_y = floor(($orig_h - $crop_h)/2);
- }
- else {
- // don't crop, just resize using $dest_w x $dest_h as a maximum bounding box
- $crop_w = $orig_w;
- $crop_h = $orig_h;
-
- $s_x = 0;
- $s_y = 0;
-
- list( $new_w, $new_h ) = wp_constrain_dimensions( $orig_w, $orig_h, $dest_w, $dest_h );
- }
-
- // if the resulting image would be the same size or larger we don't want to resize it
- if ($new_w >= $orig_w && $new_h >= $orig_h)
- return false;
-
- // the return array matches the parameters to imagecopyresampled()
- // int dst_x, int dst_y, int src_x, int src_y, int dst_w, int dst_h, int src_w, int src_h
- return array(0, 0, $s_x, $s_y, $new_w, $new_h, $crop_w, $crop_h);
-
-}
-
-/**
- * Scale down an image to fit a particular size and save a new copy of the image.
- *
- * The PNG transparency will be preserved using the function, as well as the
- * image type. If the file going in is PNG, then the resized image is going to
- * be PNG. The only supported image types are PNG, GIF, and JPEG.
- *
- * Some functionality requires API to exist, so some PHP version may lose out
- * support. This is not the fault of WordPress (where functionality is
- * downgraded, not actual defects), but of your PHP version.
- *
- * @since 2.5.0
- *
- * @param string $file Image file path.
- * @param int $max_w Maximum width to resize to.
- * @param int $max_h Maximum height to resize to.
- * @param bool $crop Optional. Whether to crop image or resize.
- * @param string $suffix Optional. File Suffix.
- * @param string $dest_path Optional. New image file path.
- * @param int $jpeg_quality Optional, default is 90. Image quality percentage.
- * @return mixed WP_Error on failure. String with new destination path. Array of dimensions from {@link image_resize_dimensions()}
- */
-function image_resize( $file, $max_w, $max_h, $crop=false, $suffix=null, $dest_path=null, $jpeg_quality=90) {
-
- $image = wp_load_image( $file );
- if ( !is_resource( $image ) )
- return new WP_Error('error_loading_image', $image);
-
- list($orig_w, $orig_h, $orig_type) = getimagesize( $file );
- $dims = image_resize_dimensions($orig_w, $orig_h, $max_w, $max_h, $crop);
- if (!$dims)
- return $dims;
- list($dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h) = $dims;
-
- $newimage = imagecreatetruecolor( $dst_w, $dst_h);
-
- // preserve PNG transparency
- if ( IMAGETYPE_PNG == $orig_type && function_exists( 'imagealphablending' ) && function_exists( 'imagesavealpha' ) ) {
- imagealphablending( $newimage, false);
- imagesavealpha( $newimage, true);
- }
-
- imagecopyresampled( $newimage, $image, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h);
-
- // we don't need the original in memory anymore
- imagedestroy( $image );
-
- // $suffix will be appended to the destination filename, just before the extension
- if ( !$suffix )
- $suffix = "{$dst_w}x{$dst_h}";
-
- $info = pathinfo($file);
- $dir = $info['dirname'];
- $ext = $info['extension'];
- $name = basename($file, ".{$ext}");
- if ( !is_null($dest_path) and $_dest_path = realpath($dest_path) )
- $dir = $_dest_path;
- $destfilename = "{$dir}/{$name}-{$suffix}.{$ext}";
-
- if ( $orig_type == IMAGETYPE_GIF ) {
- if (!imagegif( $newimage, $destfilename ) )
- return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
- }
- elseif ( $orig_type == IMAGETYPE_PNG ) {
- if (!imagepng( $newimage, $destfilename ) )
- return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
- }
- else {
- // all other formats are converted to jpg
- $destfilename = "{$dir}/{$name}-{$suffix}.jpg";
- if (!imagejpeg( $newimage, $destfilename, apply_filters( 'jpeg_quality', $jpeg_quality, 'image_resize' ) ) )
- return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
- }
-
- imagedestroy( $newimage );
-
- // Set correct file permissions
- $stat = stat( dirname( $destfilename ));
- $perms = $stat['mode'] & 0000666; //same permissions as parent folder, strip off the executable bits
- @ chmod( $destfilename, $perms );
-
- return $destfilename;
-}
-
-/**
- * Resize an image to make a thumbnail or intermediate size.
- *
- * The returned array has the file size, the image width, and image height. The
- * filter 'image_make_intermediate_size' can be used to hook in and change the
- * values of the returned array. The only parameter is the resized file path.
- *
- * @since 2.5.0
- *
- * @param string $file File path.
- * @param int $width Image width.
- * @param int $height Image height.
- * @param bool $crop Optional, default is false. Whether to crop image to specified height and width or resize.
- * @return bool|array False, if no image was created. Metadata array on success.
- */
-function image_make_intermediate_size($file, $width, $height, $crop=false) {
- if ( $width || $height ) {
- $resized_file = image_resize($file, $width, $height, $crop);
- if ( !is_wp_error($resized_file) && $resized_file && $info = getimagesize($resized_file) ) {
- $resized_file = apply_filters('image_make_intermediate_size', $resized_file);
- return array(
- 'file' => basename( $resized_file ),
- 'width' => $info[0],
- 'height' => $info[1],
- );
- }
- }
- return false;
-}
-
-/**
- * Retrieve the image's intermediate size (resized) path, width, and height.
- *
- * The $size parameter can be an array with the width and height respectively.
- * If the size matches the 'sizes' metadata array for width and height, then it
- * will be used. If there is no direct match, then the nearest image size larger
- * than the specified size will be used. If nothing is found, then the function
- * will break out and return false.
- *
- * The metadata 'sizes' is used for compatible sizes that can be used for the
- * parameter $size value.
- *
- * The url path will be given, when the $size parameter is a string.
- *
- * @since 2.5.0
- *
- * @param int $post_id Attachment ID for image.
- * @param array|string $size Optional, default is 'thumbnail'. Size of image, either array or string.
- * @return bool|array False on failure or array of file path, width, and height on success.
- */
-function image_get_intermediate_size($post_id, $size='thumbnail') {
- if ( !is_array( $imagedata = wp_get_attachment_metadata( $post_id ) ) )
- return false;
-
- // get the best one for a specified set of dimensions
- if ( is_array($size) && !empty($imagedata['sizes']) ) {
- foreach ( $imagedata['sizes'] as $_size => $data ) {
- // already cropped to width or height; so use this size
- if ( ( $data['width'] == $size[0] && $data['height'] <= $size[1] ) || ( $data['height'] == $size[1] && $data['width'] <= $size[0] ) ) {
- $file = $data['file'];
- list($width, $height) = image_constrain_size_for_editor( $data['width'], $data['height'], $size );
- return compact( 'file', 'width', 'height' );
- }
- // add to lookup table: area => size
- $areas[$data['width'] * $data['height']] = $_size;
- }
- if ( !$size || !empty($areas) ) {
- // find for the smallest image not smaller than the desired size
- ksort($areas);
- foreach ( $areas as $_size ) {
- $data = $imagedata['sizes'][$_size];
- if ( $data['width'] >= $size[0] || $data['height'] >= $size[1] ) {
- $file = $data['file'];
- list($width, $height) = image_constrain_size_for_editor( $data['width'], $data['height'], $size );
- return compact( 'file', 'width', 'height' );
- }
- }
- }
- }
-
- if ( is_array($size) || empty($size) || empty($imagedata['sizes'][$size]) )
- return false;
-
- $data = $imagedata['sizes'][$size];
- // include the full filesystem path of the intermediate file
- if ( empty($data['path']) && !empty($data['file']) ) {
- $file_url = wp_get_attachment_url($post_id);
- $data['path'] = path_join( dirname($imagedata['file']), $data['file'] );
- $data['url'] = path_join( dirname($file_url), $data['file'] );
- }
- return $data;
-}
-
-/**
- * Retrieve an image to represent an attachment.
- *
- * A mime icon for files, thumbnail or intermediate size for images.
- *
- * @since 2.5.0
- *
- * @param int $attachment_id Image attachment ID.
- * @param string $size Optional, default is 'thumbnail'.
- * @param bool $icon Optional, default is false. Whether it is an icon.
- * @return bool|array Returns an array (url, width, height), or false, if no image is available.
- */
-function wp_get_attachment_image_src($attachment_id, $size='thumbnail', $icon = false) {
-
- // get a thumbnail or intermediate image if there is one
- if ( $image = image_downsize($attachment_id, $size) )
- return $image;
-
- $src = false;
-
- if ( $icon && $src = wp_mime_type_icon($attachment_id) ) {
- $icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/crystal' );
- $src_file = $icon_dir . '/' . basename($src);
- @list($width, $height) = getimagesize($src_file);
- }
- if ( $src && $width && $height )
- return array( $src, $width, $height );
- return false;
-}
-
-/**
- * Get an HTML img element representing an image attachment
- *
- * @uses apply_filters() Calls 'wp_get_attachment_image_attributes' hook on attributes array
- * @uses wp_get_attachment_image_src() Gets attachment file URL and dimensions
- * @since 2.5.0
- *
- * @param int $attachment_id Image attachment ID.
- * @param string $size Optional, default is 'thumbnail'.
- * @param bool $icon Optional, default is false. Whether it is an icon.
- * @return string HTML img element or empty string on failure.
- */
-function wp_get_attachment_image($attachment_id, $size = 'thumbnail', $icon = false) {
-
- $html = '';
- $image = wp_get_attachment_image_src($attachment_id, $size, $icon);
- if ( $image ) {
- list($src, $width, $height) = $image;
- $hwstring = image_hwstring($width, $height);
- if ( is_array($size) )
- $size = join('x', $size);
- $attachment =& get_post($attachment_id);
- $attr = array(
- 'src' => $src,
- 'class' => "attachment-$size",
- 'alt' => trim(strip_tags( $attachment->post_excerpt )),
- 'title' => trim(strip_tags( $attachment->post_title )),
- );
- $attr = apply_filters( 'wp_get_attachment_image_attributes', $attr, $attachment );
- $attr = array_map( 'esc_attr', $attr );
- $html = rtrim("<img $hwstring");
- foreach ( $attr as $name => $value ) {
- $html .= " $name=" . '"' . $value . '"';
- }
- $html .= ' />';
- }
-
- return $html;
-}
-
-add_shortcode('wp_caption', 'img_caption_shortcode');
-add_shortcode('caption', 'img_caption_shortcode');
-
-/**
- * The Caption shortcode.
- *
- * Allows a plugin to replace the content that would otherwise be returned. The
- * filter is 'img_caption_shortcode' and passes an empty string, the attr
- * parameter and the content parameter values.
- *
- * The supported attributes for the shortcode are 'id', 'align', 'width', and
- * 'caption'.
- *
- * @since 2.6.0
- *
- * @param array $attr Attributes attributed to the shortcode.
- * @param string $content Optional. Shortcode content.
- * @return string
- */
-function img_caption_shortcode($attr, $content = null) {
-
- // Allow plugins/themes to override the default caption template.
- $output = apply_filters('img_caption_shortcode', '', $attr, $content);
- if ( $output != '' )
- return $output;
-
- extract(shortcode_atts(array(
- 'id' => '',
- 'align' => 'alignnone',
- 'width' => '',
- 'caption' => ''
- ), $attr));
-
- if ( 1 > (int) $width || empty($caption) )
- return $content;
-
- if ( $id ) $id = 'id="' . esc_attr($id) . '" ';
-
- return '<div ' . $id . 'class="wp-caption ' . esc_attr($align) . '" style="width: ' . (10 + (int) $width) . 'px">'
- . do_shortcode( $content ) . '<p class="wp-caption-text">' . $caption . '</p></div>';
-}
-
-add_shortcode('gallery', 'gallery_shortcode');
-
-/**
- * The Gallery shortcode.
- *
- * This implements the functionality of the Gallery Shortcode for displaying
- * WordPress images on a post.
- *
- * @since 2.5.0
- *
- * @param array $attr Attributes attributed to the shortcode.
- * @return string HTML content to display gallery.
- */
-function gallery_shortcode($attr) {
- global $post;
-
- static $instance = 0;
- $instance++;
-
- // Allow plugins/themes to override the default gallery template.
- $output = apply_filters('post_gallery', '', $attr);
- if ( $output != '' )
- return $output;
-
- // We're trusting author input, so let's at least make sure it looks like a valid orderby statement
- if ( isset( $attr['orderby'] ) ) {
- $attr['orderby'] = sanitize_sql_orderby( $attr['orderby'] );
- if ( !$attr['orderby'] )
- unset( $attr['orderby'] );
- }
-
- extract(shortcode_atts(array(
- 'order' => 'ASC',
- 'orderby' => 'menu_order ID',
- 'id' => $post->ID,
- 'itemtag' => 'dl',
- 'icontag' => 'dt',
- 'captiontag' => 'dd',
- 'columns' => 3,
- 'size' => 'thumbnail'
- ), $attr));
-
- $id = intval($id);
- $attachments = get_children( array('post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
-
- if ( empty($attachments) )
- return '';
-
- if ( is_feed() ) {
- $output = "\n";
- foreach ( $attachments as $att_id => $attachment )
- $output .= wp_get_attachment_link($att_id, $size, true) . "\n";
- return $output;
- }
-
- $itemtag = tag_escape($itemtag);
- $captiontag = tag_escape($captiontag);
- $columns = intval($columns);
- $itemwidth = $columns > 0 ? floor(100/$columns) : 100;
-
- $selector = "gallery-{$instance}";
-
- $output = apply_filters('gallery_style', "
- <style type='text/css'>
- #{$selector} {
- margin: auto;
- }
- #{$selector} .gallery-item {
- float: left;
- margin-top: 10px;
- text-align: center;
- width: {$itemwidth}%; }
- #{$selector} img {
- border: 2px solid #cfcfcf;
- }
- #{$selector} .gallery-caption {
- margin-left: 0;
- }
- </style>
- <!-- see gallery_shortcode() in wp-includes/media.php -->
- <div id='$selector' class='gallery galleryid-{$id}'>");
-
- $i = 0;
- foreach ( $attachments as $id => $attachment ) {
- $link = isset($attr['link']) && 'file' == $attr['link'] ? wp_get_attachment_link($id, $size, false, false) : wp_get_attachment_link($id, $size, true, false);
-
- $output .= "<{$itemtag} class='gallery-item'>";
- $output .= "
- <{$icontag} class='gallery-icon'>
- $link
- </{$icontag}>";
- if ( $captiontag && trim($attachment->post_excerpt) ) {
- $output .= "
- <{$captiontag} class='gallery-caption'>
- " . wptexturize($attachment->post_excerpt) . "
- </{$captiontag}>";
- }
- $output .= "</{$itemtag}>";
- if ( $columns > 0 && ++$i % $columns == 0 )
- $output .= '<br style="clear: both" />';
- }
-
- $output .= "
- <br style='clear: both;' />
- </div>\n";
-
- return $output;
-}
-
-/**
- * Display previous image link that has the same post parent.
- *
- * @since 2.5.0
- * @param string $size Optional, default is 'thumbnail'. Size of image, either array or string. 0 or 'none' will default to post_title or $text;
- * @param string $text Optional, default is false. If included, link will reflect $text variable.
- * @return string HTML content.
- */
-function previous_image_link($size = 'thumbnail', $text = false) {
- adjacent_image_link(true, $size, $text);
-}
-
-/**
- * Display next image link that has the same post parent.
- *
- * @since 2.5.0
- * @param string $size Optional, default is 'thumbnail'. Size of image, either array or string. 0 or 'none' will default to post_title or $text;
- * @param string $text Optional, default is false. If included, link will reflect $text variable.
- * @return string HTML content.
- */
-function next_image_link($size = 'thumbnail', $text = false) {
- adjacent_image_link(false, $size, $text);
-}
-
-/**
- * Display next or previous image link that has the same post parent.
- *
- * Retrieves the current attachment object from the $post global.
- *
- * @since 2.5.0
- *
- * @param bool $prev Optional. Default is true to display previous link, true for next.
- */
-function adjacent_image_link($prev = true, $size = 'thumbnail', $text = false) {
- global $post;
- $post = get_post($post);
- $attachments = array_values(get_children( array('post_parent' => $post->post_parent, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => 'ASC', 'orderby' => 'menu_order ID') ));
-
- foreach ( $attachments as $k => $attachment )
- if ( $attachment->ID == $post->ID )
- break;
-
- $k = $prev ? $k - 1 : $k + 1;
-
- if ( isset($attachments[$k]) )
- echo wp_get_attachment_link($attachments[$k]->ID, $size, true, false, $text);
-}
-
-/**
- * Retrieve taxonomies attached to the attachment.
- *
- * @since 2.5.0
- *
- * @param int|array|object $attachment Attachment ID, Attachment data array, or Attachment data object.
- * @return array Empty array on failure. List of taxonomies on success.
- */
-function get_attachment_taxonomies($attachment) {
- if ( is_int( $attachment ) )
- $attachment = get_post($attachment);
- else if ( is_array($attachment) )
- $attachment = (object) $attachment;
-
- if ( ! is_object($attachment) )
- return array();
-
- $filename = basename($attachment->guid);
-
- $objects = array('attachment');
-
- if ( false !== strpos($filename, '.') )
- $objects[] = 'attachment:' . substr($filename, strrpos($filename, '.') + 1);
- if ( !empty($attachment->post_mime_type) ) {
- $objects[] = 'attachment:' . $attachment->post_mime_type;
- if ( false !== strpos($attachment->post_mime_type, '/') )
- foreach ( explode('/', $attachment->post_mime_type) as $token )
- if ( !empty($token) )
- $objects[] = "attachment:$token";
- }
-
- $taxonomies = array();
- foreach ( $objects as $object )
- if ( $taxes = get_object_taxonomies($object) )
- $taxonomies = array_merge($taxonomies, $taxes);
-
- return array_unique($taxonomies);
-}
-
-?>
+<?php
+/**
+ * WordPress API for media display.
+ *
+ * @package WordPress
+ */
+
+/**
+ * Scale down the default size of an image.
+ *
+ * This is so that the image is a better fit for the editor and theme.
+ *
+ * The $size parameter accepts either an array or a string. The supported string
+ * values are 'thumb' or 'thumbnail' for the given thumbnail size or defaults at
+ * 128 width and 96 height in pixels. Also supported for the string value is
+ * 'medium' and 'full'. The 'full' isn't actually supported, but any value other
+ * than the supported will result in the content_width size or 500 if that is
+ * not set.
+ *
+ * Finally, there is a filter named, 'editor_max_image_size' that will be called
+ * on the calculated array for width and height, respectively. The second
+ * parameter will be the value that was in the $size parameter. The returned
+ * type for the hook is an array with the width as the first element and the
+ * height as the second element.
+ *
+ * @since 2.5.0
+ * @uses wp_constrain_dimensions() This function passes the widths and the heights.
+ *
+ * @param int $width Width of the image
+ * @param int $height Height of the image
+ * @param string|array $size Size of what the result image should be.
+ * @return array Width and height of what the result image should resize to.
+ */
+function image_constrain_size_for_editor($width, $height, $size = 'medium') {
+ global $content_width, $_wp_additional_image_sizes;
+
+ if ( is_array($size) ) {
+ $max_width = $size[0];
+ $max_height = $size[1];
+ }
+ elseif ( $size == 'thumb' || $size == 'thumbnail' ) {
+ $max_width = intval(get_option('thumbnail_size_w'));
+ $max_height = intval(get_option('thumbnail_size_h'));
+ // last chance thumbnail size defaults
+ if ( !$max_width && !$max_height ) {
+ $max_width = 128;
+ $max_height = 96;
+ }
+ }
+ elseif ( $size == 'medium' ) {
+ $max_width = intval(get_option('medium_size_w'));
+ $max_height = intval(get_option('medium_size_h'));
+ // if no width is set, default to the theme content width if available
+ }
+ elseif ( $size == 'large' ) {
+ // we're inserting a large size image into the editor. if it's a really
+ // big image we'll scale it down to fit reasonably within the editor
+ // itself, and within the theme's content width if it's known. the user
+ // can resize it in the editor if they wish.
+ $max_width = intval(get_option('large_size_w'));
+ $max_height = intval(get_option('large_size_h'));
+ if ( intval($content_width) > 0 )
+ $max_width = min( intval($content_width), $max_width );
+ } elseif ( isset( $_wp_additional_image_sizes ) && count( $_wp_additional_image_sizes ) && in_array( $size, array_keys( $_wp_additional_image_sizes ) ) ) {
+ $max_width = intval( $_wp_additional_image_sizes[$size]['width'] );
+ $max_height = intval( $_wp_additional_image_sizes[$size]['height'] );
+ if ( intval($content_width) > 0 )
+ $max_width = min( intval($content_width), $max_width );
+ }
+ // $size == 'full' has no constraint
+ else {
+ $max_width = $width;
+ $max_height = $height;
+ }
+
+ list( $max_width, $max_height ) = apply_filters( 'editor_max_image_size', array( $max_width, $max_height ), $size );
+
+ return wp_constrain_dimensions( $width, $height, $max_width, $max_height );
+}
+
+/**
+ * Retrieve width and height attributes using given width and height values.
+ *
+ * Both attributes are required in the sense that both parameters must have a
+ * value, but are optional in that if you set them to false or null, then they
+ * will not be added to the returned string.
+ *
+ * You can set the value using a string, but it will only take numeric values.
+ * If you wish to put 'px' after the numbers, then it will be stripped out of
+ * the return.
+ *
+ * @since 2.5.0
+ *
+ * @param int|string $width Optional. Width attribute value.
+ * @param int|string $height Optional. Height attribute value.
+ * @return string HTML attributes for width and, or height.
+ */
+function image_hwstring($width, $height) {
+ $out = '';
+ if ($width)
+ $out .= 'width="'.intval($width).'" ';
+ if ($height)
+ $out .= 'height="'.intval($height).'" ';
+ return $out;
+}
+
+/**
+ * Scale an image to fit a particular size (such as 'thumb' or 'medium').
+ *
+ * Array with image url, width, height, and whether is intermediate size, in
+ * that order is returned on success is returned. $is_intermediate is true if
+ * $url is a resized image, false if it is the original.
+ *
+ * The URL might be the original image, or it might be a resized version. This
+ * function won't create a new resized copy, it will just return an already
+ * resized one if it exists.
+ *
+ * A plugin may use the 'image_downsize' filter to hook into and offer image
+ * resizing services for images. The hook must return an array with the same
+ * elements that are returned in the function. The first element being the URL
+ * to the new image that was resized.
+ *
+ * @since 2.5.0
+ * @uses apply_filters() Calls 'image_downsize' on $id and $size to provide
+ * resize services.
+ *
+ * @param int $id Attachment ID for image.
+ * @param string $size Optional, default is 'medium'. Size of image, can be 'thumbnail'.
+ * @return bool|array False on failure, array on success.
+ */
+function image_downsize($id, $size = 'medium') {
+
+ if ( !wp_attachment_is_image($id) )
+ return false;
+
+ $img_url = wp_get_attachment_url($id);
+ $meta = wp_get_attachment_metadata($id);
+ $width = $height = 0;
+ $is_intermediate = false;
+
+ // plugins can use this to provide resize services
+ if ( $out = apply_filters('image_downsize', false, $id, $size) )
+ return $out;
+
+ // try for a new style intermediate size
+ if ( $intermediate = image_get_intermediate_size($id, $size) ) {
+ $img_url = str_replace(basename($img_url), $intermediate['file'], $img_url);
+ $width = $intermediate['width'];
+ $height = $intermediate['height'];
+ $is_intermediate = true;
+ }
+ elseif ( $size == 'thumbnail' ) {
+ // fall back to the old thumbnail
+ if ( ($thumb_file = wp_get_attachment_thumb_file($id)) && $info = getimagesize($thumb_file) ) {
+ $img_url = str_replace(basename($img_url), basename($thumb_file), $img_url);
+ $width = $info[0];
+ $height = $info[1];
+ $is_intermediate = true;
+ }
+ }
+ if ( !$width && !$height && isset($meta['width'], $meta['height']) ) {
+ // any other type: use the real image
+ $width = $meta['width'];
+ $height = $meta['height'];
+ }
+
+ if ( $img_url) {
+ // we have the actual image size, but might need to further constrain it if content_width is narrower
+ list( $width, $height ) = image_constrain_size_for_editor( $width, $height, $size );
+
+ return array( $img_url, $width, $height, $is_intermediate );
+ }
+ return false;
+
+}
+
+/**
+ * Registers a new image size
+ */
+function add_image_size( $name, $width = 0, $height = 0, $crop = FALSE ) {
+ global $_wp_additional_image_sizes;
+ $_wp_additional_image_sizes[$name] = array( 'width' => absint( $width ), 'height' => absint( $height ), 'crop' => !!$crop );
+}
+
+/**
+ * Registers an image size for the post thumbnail
+ */
+function set_post_thumbnail_size( $width = 0, $height = 0, $crop = FALSE ) {
+ add_image_size( 'post-thumbnail', $width, $height, $crop );
+}
+
+/**
+ * An <img src /> tag for an image attachment, scaling it down if requested.
+ *
+ * The filter 'get_image_tag_class' allows for changing the class name for the
+ * image without having to use regular expressions on the HTML content. The
+ * parameters are: what WordPress will use for the class, the Attachment ID,
+ * image align value, and the size the image should be.
+ *
+ * The second filter 'get_image_tag' has the HTML content, which can then be
+ * further manipulated by a plugin to change all attribute values and even HTML
+ * content.
+ *
+ * @since 2.5.0
+ *
+ * @uses apply_filters() The 'get_image_tag_class' filter is the IMG element
+ * class attribute.
+ * @uses apply_filters() The 'get_image_tag' filter is the full IMG element with
+ * all attributes.
+ *
+ * @param int $id Attachment ID.
+ * @param string $alt Image Description for the alt attribute.
+ * @param string $title Image Description for the title attribute.
+ * @param string $align Part of the class name for aligning the image.
+ * @param string $size Optional. Default is 'medium'.
+ * @return string HTML IMG element for given image attachment
+ */
+function get_image_tag($id, $alt, $title, $align, $size='medium') {
+
+ list( $img_src, $width, $height ) = image_downsize($id, $size);
+ $hwstring = image_hwstring($width, $height);
+
+ $class = 'align' . esc_attr($align) .' size-' . esc_attr($size) . ' wp-image-' . $id;
+ $class = apply_filters('get_image_tag_class', $class, $id, $align, $size);
+
+ $html = '<img src="' . esc_attr($img_src) . '" alt="' . esc_attr($alt) . '" title="' . esc_attr($title).'" '.$hwstring.'class="'.$class.'" />';
+
+ $html = apply_filters( 'get_image_tag', $html, $id, $alt, $title, $align, $size );
+
+ return $html;
+}
+
+/**
+ * Calculates the new dimentions for a downsampled image.
+ *
+ * Same as {@link wp_shrink_dimensions()}, except the max parameters are
+ * optional. If either width or height are empty, no constraint is applied on
+ * that dimension.
+ *
+ * @since 2.5.0
+ *
+ * @param int $current_width Current width of the image.
+ * @param int $current_height Current height of the image.
+ * @param int $max_width Optional. Maximum wanted width.
+ * @param int $max_height Optional. Maximum wanted height.
+ * @return array First item is the width, the second item is the height.
+ */
+function wp_constrain_dimensions( $current_width, $current_height, $max_width=0, $max_height=0 ) {
+ if ( !$max_width and !$max_height )
+ return array( $current_width, $current_height );
+
+ $width_ratio = $height_ratio = 1.0;
+
+ if ( $max_width > 0 && $current_width > 0 && $current_width > $max_width )
+ $width_ratio = $max_width / $current_width;
+
+ if ( $max_height > 0 && $current_height > 0 && $current_height > $max_height )
+ $height_ratio = $max_height / $current_height;
+
+ // the smaller ratio is the one we need to fit it to the constraining box
+ $ratio = min( $width_ratio, $height_ratio );
+
+ return array( intval($current_width * $ratio), intval($current_height * $ratio) );
+}
+
+/**
+ * Retrieve calculated resized dimensions for use in imagecopyresampled().
+ *
+ * Calculate dimensions and coordinates for a resized image that fits within a
+ * specified width and height. If $crop is true, the largest matching central
+ * portion of the image will be cropped out and resized to the required size.
+ *
+ * @since 2.5.0
+ *
+ * @param int $orig_w Original width.
+ * @param int $orig_h Original height.
+ * @param int $dest_w New width.
+ * @param int $dest_h New height.
+ * @param bool $crop Optional, default is false. Whether to crop image or resize.
+ * @return bool|array False, on failure. Returned array matches parameters for imagecopyresampled() PHP function.
+ */
+function image_resize_dimensions($orig_w, $orig_h, $dest_w, $dest_h, $crop = false) {
+
+ if ($orig_w <= 0 || $orig_h <= 0)
+ return false;
+ // at least one of dest_w or dest_h must be specific
+ if ($dest_w <= 0 && $dest_h <= 0)
+ return false;
+
+ if ( $crop ) {
+ // crop the largest possible portion of the original image that we can size to $dest_w x $dest_h
+ $aspect_ratio = $orig_w / $orig_h;
+ $new_w = min($dest_w, $orig_w);
+ $new_h = min($dest_h, $orig_h);
+
+ if ( !$new_w ) {
+ $new_w = intval($new_h * $aspect_ratio);
+ }
+
+ if ( !$new_h ) {
+ $new_h = intval($new_w / $aspect_ratio);
+ }
+
+ $size_ratio = max($new_w / $orig_w, $new_h / $orig_h);
+
+ $crop_w = round($new_w / $size_ratio);
+ $crop_h = round($new_h / $size_ratio);
+
+ $s_x = floor( ($orig_w - $crop_w) / 2 );
+ $s_y = floor( ($orig_h - $crop_h) / 2 );
+ } else {
+ // don't crop, just resize using $dest_w x $dest_h as a maximum bounding box
+ $crop_w = $orig_w;
+ $crop_h = $orig_h;
+
+ $s_x = 0;
+ $s_y = 0;
+
+ list( $new_w, $new_h ) = wp_constrain_dimensions( $orig_w, $orig_h, $dest_w, $dest_h );
+ }
+
+ // if the resulting image would be the same size or larger we don't want to resize it
+ if ( $new_w >= $orig_w && $new_h >= $orig_h )
+ return false;
+
+ // the return array matches the parameters to imagecopyresampled()
+ // int dst_x, int dst_y, int src_x, int src_y, int dst_w, int dst_h, int src_w, int src_h
+ return array( 0, 0, (int) $s_x, (int) $s_y, (int) $new_w, (int) $new_h, (int) $crop_w, (int) $crop_h );
+
+}
+
+/**
+ * Scale down an image to fit a particular size and save a new copy of the image.
+ *
+ * The PNG transparency will be preserved using the function, as well as the
+ * image type. If the file going in is PNG, then the resized image is going to
+ * be PNG. The only supported image types are PNG, GIF, and JPEG.
+ *
+ * Some functionality requires API to exist, so some PHP version may lose out
+ * support. This is not the fault of WordPress (where functionality is
+ * downgraded, not actual defects), but of your PHP version.
+ *
+ * @since 2.5.0
+ *
+ * @param string $file Image file path.
+ * @param int $max_w Maximum width to resize to.
+ * @param int $max_h Maximum height to resize to.
+ * @param bool $crop Optional. Whether to crop image or resize.
+ * @param string $suffix Optional. File Suffix.
+ * @param string $dest_path Optional. New image file path.
+ * @param int $jpeg_quality Optional, default is 90. Image quality percentage.
+ * @return mixed WP_Error on failure. String with new destination path. Array of dimensions from {@link image_resize_dimensions()}
+ */
+function image_resize( $file, $max_w, $max_h, $crop = false, $suffix = null, $dest_path = null, $jpeg_quality = 90 ) {
+
+ $image = wp_load_image( $file );
+ if ( !is_resource( $image ) )
+ return new WP_Error('error_loading_image', $image);
+
+ $size = @getimagesize( $file );
+ if ( !$size )
+ return new WP_Error('invalid_image', __('Could not read image size'), $file);
+ list($orig_w, $orig_h, $orig_type) = $size;
+
+ $dims = image_resize_dimensions($orig_w, $orig_h, $max_w, $max_h, $crop);
+ if ( !$dims )
+ return $dims;
+ list($dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h) = $dims;
+
+ $newimage = wp_imagecreatetruecolor( $dst_w, $dst_h );
+
+ imagecopyresampled( $newimage, $image, $dst_x, $dst_y, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h);
+
+ // convert from full colors to index colors, like original PNG.
+ if ( IMAGETYPE_PNG == $orig_type && !imageistruecolor( $image ) )
+ imagetruecolortopalette( $newimage, false, imagecolorstotal( $image ) );
+
+ // we don't need the original in memory anymore
+ imagedestroy( $image );
+
+ // $suffix will be appended to the destination filename, just before the extension
+ if ( !$suffix )
+ $suffix = "{$dst_w}x{$dst_h}";
+
+ $info = pathinfo($file);
+ $dir = $info['dirname'];
+ $ext = $info['extension'];
+ $name = basename($file, ".{$ext}");
+ if ( !is_null($dest_path) and $_dest_path = realpath($dest_path) )
+ $dir = $_dest_path;
+ $destfilename = "{$dir}/{$name}-{$suffix}.{$ext}";
+
+ if ( IMAGETYPE_GIF == $orig_type ) {
+ if ( !imagegif( $newimage, $destfilename ) )
+ return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
+ } elseif ( IMAGETYPE_PNG == $orig_type ) {
+ if ( !imagepng( $newimage, $destfilename ) )
+ return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
+ } else {
+ // all other formats are converted to jpg
+ $destfilename = "{$dir}/{$name}-{$suffix}.jpg";
+ if ( !imagejpeg( $newimage, $destfilename, apply_filters( 'jpeg_quality', $jpeg_quality, 'image_resize' ) ) )
+ return new WP_Error('resize_path_invalid', __( 'Resize path invalid' ));
+ }
+
+ imagedestroy( $newimage );
+
+ // Set correct file permissions
+ $stat = stat( dirname( $destfilename ));
+ $perms = $stat['mode'] & 0000666; //same permissions as parent folder, strip off the executable bits
+ @ chmod( $destfilename, $perms );
+
+ return $destfilename;
+}
+
+/**
+ * Resize an image to make a thumbnail or intermediate size.
+ *
+ * The returned array has the file size, the image width, and image height. The
+ * filter 'image_make_intermediate_size' can be used to hook in and change the
+ * values of the returned array. The only parameter is the resized file path.
+ *
+ * @since 2.5.0
+ *
+ * @param string $file File path.
+ * @param int $width Image width.
+ * @param int $height Image height.
+ * @param bool $crop Optional, default is false. Whether to crop image to specified height and width or resize.
+ * @return bool|array False, if no image was created. Metadata array on success.
+ */
+function image_make_intermediate_size($file, $width, $height, $crop=false) {
+ if ( $width || $height ) {
+ $resized_file = image_resize($file, $width, $height, $crop);
+ if ( !is_wp_error($resized_file) && $resized_file && $info = getimagesize($resized_file) ) {
+ $resized_file = apply_filters('image_make_intermediate_size', $resized_file);
+ return array(
+ 'file' => basename( $resized_file ),
+ 'width' => $info[0],
+ 'height' => $info[1],
+ );
+ }
+ }
+ return false;
+}
+
+/**
+ * Retrieve the image's intermediate size (resized) path, width, and height.
+ *
+ * The $size parameter can be an array with the width and height respectively.
+ * If the size matches the 'sizes' metadata array for width and height, then it
+ * will be used. If there is no direct match, then the nearest image size larger
+ * than the specified size will be used. If nothing is found, then the function
+ * will break out and return false.
+ *
+ * The metadata 'sizes' is used for compatible sizes that can be used for the
+ * parameter $size value.
+ *
+ * The url path will be given, when the $size parameter is a string.
+ *
+ * @since 2.5.0
+ *
+ * @param int $post_id Attachment ID for image.
+ * @param array|string $size Optional, default is 'thumbnail'. Size of image, either array or string.
+ * @return bool|array False on failure or array of file path, width, and height on success.
+ */
+function image_get_intermediate_size($post_id, $size='thumbnail') {
+ if ( !is_array( $imagedata = wp_get_attachment_metadata( $post_id ) ) )
+ return false;
+
+ // get the best one for a specified set of dimensions
+ if ( is_array($size) && !empty($imagedata['sizes']) ) {
+ foreach ( $imagedata['sizes'] as $_size => $data ) {
+ // already cropped to width or height; so use this size
+ if ( ( $data['width'] == $size[0] && $data['height'] <= $size[1] ) || ( $data['height'] == $size[1] && $data['width'] <= $size[0] ) ) {
+ $file = $data['file'];
+ list($width, $height) = image_constrain_size_for_editor( $data['width'], $data['height'], $size );
+ return compact( 'file', 'width', 'height' );
+ }
+ // add to lookup table: area => size
+ $areas[$data['width'] * $data['height']] = $_size;
+ }
+ if ( !$size || !empty($areas) ) {
+ // find for the smallest image not smaller than the desired size
+ ksort($areas);
+ foreach ( $areas as $_size ) {
+ $data = $imagedata['sizes'][$_size];
+ if ( $data['width'] >= $size[0] || $data['height'] >= $size[1] ) {
+ $file = $data['file'];
+ list($width, $height) = image_constrain_size_for_editor( $data['width'], $data['height'], $size );
+ return compact( 'file', 'width', 'height' );
+ }
+ }
+ }
+ }
+
+ if ( is_array($size) || empty($size) || empty($imagedata['sizes'][$size]) )
+ return false;
+
+ $data = $imagedata['sizes'][$size];
+ // include the full filesystem path of the intermediate file
+ if ( empty($data['path']) && !empty($data['file']) ) {
+ $file_url = wp_get_attachment_url($post_id);
+ $data['path'] = path_join( dirname($imagedata['file']), $data['file'] );
+ $data['url'] = path_join( dirname($file_url), $data['file'] );
+ }
+ return $data;
+}
+
+/**
+ * Retrieve an image to represent an attachment.
+ *
+ * A mime icon for files, thumbnail or intermediate size for images.
+ *
+ * @since 2.5.0
+ *
+ * @param int $attachment_id Image attachment ID.
+ * @param string $size Optional, default is 'thumbnail'.
+ * @param bool $icon Optional, default is false. Whether it is an icon.
+ * @return bool|array Returns an array (url, width, height), or false, if no image is available.
+ */
+function wp_get_attachment_image_src($attachment_id, $size='thumbnail', $icon = false) {
+
+ // get a thumbnail or intermediate image if there is one
+ if ( $image = image_downsize($attachment_id, $size) )
+ return $image;
+
+ $src = false;
+
+ if ( $icon && $src = wp_mime_type_icon($attachment_id) ) {
+ $icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/crystal' );
+ $src_file = $icon_dir . '/' . basename($src);
+ @list($width, $height) = getimagesize($src_file);
+ }
+ if ( $src && $width && $height )
+ return array( $src, $width, $height );
+ return false;
+}
+
+/**
+ * Get an HTML img element representing an image attachment
+ *
+ * @uses apply_filters() Calls 'wp_get_attachment_image_attributes' hook on attributes array
+ * @uses wp_get_attachment_image_src() Gets attachment file URL and dimensions
+ * @since 2.5.0
+ *
+ * @param int $attachment_id Image attachment ID.
+ * @param string $size Optional, default is 'thumbnail'.
+ * @param bool $icon Optional, default is false. Whether it is an icon.
+ * @return string HTML img element or empty string on failure.
+ */
+function wp_get_attachment_image($attachment_id, $size = 'thumbnail', $icon = false, $attr = '') {
+
+ $html = '';
+ $image = wp_get_attachment_image_src($attachment_id, $size, $icon);
+ if ( $image ) {
+ list($src, $width, $height) = $image;
+ $hwstring = image_hwstring($width, $height);
+ if ( is_array($size) )
+ $size = join('x', $size);
+ $attachment =& get_post($attachment_id);
+ $default_attr = array(
+ 'src' => $src,
+ 'class' => "attachment-$size",
+ 'alt' => trim(strip_tags( $attachment->post_excerpt )),
+ 'title' => trim(strip_tags( $attachment->post_title )),
+ );
+ $attr = wp_parse_args($attr, $default_attr);
+ $attr = apply_filters( 'wp_get_attachment_image_attributes', $attr, $attachment );
+ $attr = array_map( 'esc_attr', $attr );
+ $html = rtrim("<img $hwstring");
+ foreach ( $attr as $name => $value ) {
+ $html .= " $name=" . '"' . $value . '"';
+ }
+ $html .= ' />';
+ }
+
+ return $html;
+}
+
+/**
+ * Adds a 'wp-post-image' class to post thumbnail thumbnails
+ * Uses the begin_fetch_post_thumbnail_html and end_fetch_post_thumbnail_html action hooks to
+ * dynamically add/remove itself so as to only filter post thumbnail thumbnails
+ *
+ * @author Mark Jaquith
+ * @since 2.9.0
+ * @param array $attr Attributes including src, class, alt, title
+ * @return array
+ */
+function _wp_post_thumbnail_class_filter( $attr ) {
+ $attr['class'] .= ' wp-post-image';
+ return $attr;
+}
+
+/**
+ * Adds _wp_post_thumbnail_class_filter to the wp_get_attachment_image_attributes filter
+ *
+ * @author Mark Jaquith
+ * @since 2.9.0
+ */
+function _wp_post_thumbnail_class_filter_add( $attr ) {
+ add_filter( 'wp_get_attachment_image_attributes', '_wp_post_thumbnail_class_filter' );
+}
+
+/**
+ * Removes _wp_post_thumbnail_class_filter from the wp_get_attachment_image_attributes filter
+ *
+ * @author Mark Jaquith
+ * @since 2.9.0
+ */
+function _wp_post_thumbnail_class_filter_remove( $attr ) {
+ remove_filter( 'wp_get_attachment_image_attributes', '_wp_post_thumbnail_class_filter' );
+}
+
+add_shortcode('wp_caption', 'img_caption_shortcode');
+add_shortcode('caption', 'img_caption_shortcode');
+
+/**
+ * The Caption shortcode.
+ *
+ * Allows a plugin to replace the content that would otherwise be returned. The
+ * filter is 'img_caption_shortcode' and passes an empty string, the attr
+ * parameter and the content parameter values.
+ *
+ * The supported attributes for the shortcode are 'id', 'align', 'width', and
+ * 'caption'.
+ *
+ * @since 2.6.0
+ *
+ * @param array $attr Attributes attributed to the shortcode.
+ * @param string $content Optional. Shortcode content.
+ * @return string
+ */
+function img_caption_shortcode($attr, $content = null) {
+
+ // Allow plugins/themes to override the default caption template.
+ $output = apply_filters('img_caption_shortcode', '', $attr, $content);
+ if ( $output != '' )
+ return $output;
+
+ extract(shortcode_atts(array(
+ 'id' => '',
+ 'align' => 'alignnone',
+ 'width' => '',
+ 'caption' => ''
+ ), $attr));
+
+ if ( 1 > (int) $width || empty($caption) )
+ return $content;
+
+ if ( $id ) $id = 'id="' . esc_attr($id) . '" ';
+
+ return '<div ' . $id . 'class="wp-caption ' . esc_attr($align) . '" style="width: ' . (10 + (int) $width) . 'px">'
+ . do_shortcode( $content ) . '<p class="wp-caption-text">' . $caption . '</p></div>';
+}
+
+add_shortcode('gallery', 'gallery_shortcode');
+
+/**
+ * The Gallery shortcode.
+ *
+ * This implements the functionality of the Gallery Shortcode for displaying
+ * WordPress images on a post.
+ *
+ * @since 2.5.0
+ *
+ * @param array $attr Attributes attributed to the shortcode.
+ * @return string HTML content to display gallery.
+ */
+function gallery_shortcode($attr) {
+ global $post, $wp_locale;
+
+ static $instance = 0;
+ $instance++;
+
+ // Allow plugins/themes to override the default gallery template.
+ $output = apply_filters('post_gallery', '', $attr);
+ if ( $output != '' )
+ return $output;
+
+ // We're trusting author input, so let's at least make sure it looks like a valid orderby statement
+ if ( isset( $attr['orderby'] ) ) {
+ $attr['orderby'] = sanitize_sql_orderby( $attr['orderby'] );
+ if ( !$attr['orderby'] )
+ unset( $attr['orderby'] );
+ }
+
+ extract(shortcode_atts(array(
+ 'order' => 'ASC',
+ 'orderby' => 'menu_order ID',
+ 'id' => $post->ID,
+ 'itemtag' => 'dl',
+ 'icontag' => 'dt',
+ 'captiontag' => 'dd',
+ 'columns' => 3,
+ 'size' => 'thumbnail',
+ 'include' => '',
+ 'exclude' => ''
+ ), $attr));
+
+ $id = intval($id);
+ if ( 'RAND' == $order )
+ $orderby = 'none';
+
+ if ( !empty($include) ) {
+ $include = preg_replace( '/[^0-9,]+/', '', $include );
+ $_attachments = get_posts( array('include' => $include, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
+
+ $attachments = array();
+ foreach ( $_attachments as $key => $val ) {
+ $attachments[$val->ID] = $_attachments[$key];
+ }
+ } elseif ( !empty($exclude) ) {
+ $exclude = preg_replace( '/[^0-9,]+/', '', $exclude );
+ $attachments = get_children( array('post_parent' => $id, 'exclude' => $exclude, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
+ } else {
+ $attachments = get_children( array('post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
+ }
+
+ if ( empty($attachments) )
+ return '';
+
+ if ( is_feed() ) {
+ $output = "\n";
+ foreach ( $attachments as $att_id => $attachment )
+ $output .= wp_get_attachment_link($att_id, $size, true) . "\n";
+ return $output;
+ }
+
+ $itemtag = tag_escape($itemtag);
+ $captiontag = tag_escape($captiontag);
+ $columns = intval($columns);
+ $itemwidth = $columns > 0 ? floor(100/$columns) : 100;
+ $float = $wp_locale->text_direction == 'rtl' ? 'right' : 'left';
+
+ $selector = "gallery-{$instance}";
+
+ $output = apply_filters('gallery_style', "
+ <style type='text/css'>
+ #{$selector} {
+ margin: auto;
+ }
+ #{$selector} .gallery-item {
+ float: {$float};
+ margin-top: 10px;
+ text-align: center;
+ width: {$itemwidth}%; }
+ #{$selector} img {
+ border: 2px solid #cfcfcf;
+ }
+ #{$selector} .gallery-caption {
+ margin-left: 0;
+ }
+ </style>
+ <!-- see gallery_shortcode() in wp-includes/media.php -->
+ <div id='$selector' class='gallery galleryid-{$id}'>");
+
+ $i = 0;
+ foreach ( $attachments as $id => $attachment ) {
+ $link = isset($attr['link']) && 'file' == $attr['link'] ? wp_get_attachment_link($id, $size, false, false) : wp_get_attachment_link($id, $size, true, false);
+
+ $output .= "<{$itemtag} class='gallery-item'>";
+ $output .= "
+ <{$icontag} class='gallery-icon'>
+ $link
+ </{$icontag}>";
+ if ( $captiontag && trim($attachment->post_excerpt) ) {
+ $output .= "
+ <{$captiontag} class='gallery-caption'>
+ " . wptexturize($attachment->post_excerpt) . "
+ </{$captiontag}>";
+ }
+ $output .= "</{$itemtag}>";
+ if ( $columns > 0 && ++$i % $columns == 0 )
+ $output .= '<br style="clear: both" />';
+ }
+
+ $output .= "
+ <br style='clear: both;' />
+ </div>\n";
+
+ return $output;
+}
+
+/**
+ * Display previous image link that has the same post parent.
+ *
+ * @since 2.5.0
+ * @param string $size Optional, default is 'thumbnail'. Size of image, either array or string. 0 or 'none' will default to post_title or $text;
+ * @param string $text Optional, default is false. If included, link will reflect $text variable.
+ * @return string HTML content.
+ */
+function previous_image_link($size = 'thumbnail', $text = false) {
+ adjacent_image_link(true, $size, $text);
+}
+
+/**
+ * Display next image link that has the same post parent.
+ *
+ * @since 2.5.0
+ * @param string $size Optional, default is 'thumbnail'. Size of image, either array or string. 0 or 'none' will default to post_title or $text;
+ * @param string $text Optional, default is false. If included, link will reflect $text variable.
+ * @return string HTML content.
+ */
+function next_image_link($size = 'thumbnail', $text = false) {
+ adjacent_image_link(false, $size, $text);
+}
+
+/**
+ * Display next or previous image link that has the same post parent.
+ *
+ * Retrieves the current attachment object from the $post global.
+ *
+ * @since 2.5.0
+ *
+ * @param bool $prev Optional. Default is true to display previous link, true for next.
+ */
+function adjacent_image_link($prev = true, $size = 'thumbnail', $text = false) {
+ global $post;
+ $post = get_post($post);
+ $attachments = array_values(get_children( array('post_parent' => $post->post_parent, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => 'ASC', 'orderby' => 'menu_order ID') ));
+
+ foreach ( $attachments as $k => $attachment )
+ if ( $attachment->ID == $post->ID )
+ break;
+
+ $k = $prev ? $k - 1 : $k + 1;
+
+ if ( isset($attachments[$k]) )
+ echo wp_get_attachment_link($attachments[$k]->ID, $size, true, false, $text);
+}
+
+/**
+ * Retrieve taxonomies attached to the attachment.
+ *
+ * @since 2.5.0
+ *
+ * @param int|array|object $attachment Attachment ID, Attachment data array, or Attachment data object.
+ * @return array Empty array on failure. List of taxonomies on success.
+ */
+function get_attachment_taxonomies($attachment) {
+ if ( is_int( $attachment ) )
+ $attachment = get_post($attachment);
+ else if ( is_array($attachment) )
+ $attachment = (object) $attachment;
+
+ if ( ! is_object($attachment) )
+ return array();
+
+ $filename = basename($attachment->guid);
+
+ $objects = array('attachment');
+
+ if ( false !== strpos($filename, '.') )
+ $objects[] = 'attachment:' . substr($filename, strrpos($filename, '.') + 1);
+ if ( !empty($attachment->post_mime_type) ) {
+ $objects[] = 'attachment:' . $attachment->post_mime_type;
+ if ( false !== strpos($attachment->post_mime_type, '/') )
+ foreach ( explode('/', $attachment->post_mime_type) as $token )
+ if ( !empty($token) )
+ $objects[] = "attachment:$token";
+ }
+
+ $taxonomies = array();
+ foreach ( $objects as $object )
+ if ( $taxes = get_object_taxonomies($object) )
+ $taxonomies = array_merge($taxonomies, $taxes);
+
+ return array_unique($taxonomies);
+}
+
+/**
+ * Check if the installed version of GD supports particular image type
+ *
+ * @since 2.9.0
+ *
+ * @param $mime_type string
+ * @return bool
+ */
+function gd_edit_image_support($mime_type) {
+ if ( function_exists('imagetypes') ) {
+ switch( $mime_type ) {
+ case 'image/jpeg':
+ return (imagetypes() & IMG_JPG) != 0;
+ case 'image/png':
+ return (imagetypes() & IMG_PNG) != 0;
+ case 'image/gif':
+ return (imagetypes() & IMG_GIF) != 0;
+ }
+ } else {
+ switch( $mime_type ) {
+ case 'image/jpeg':
+ return function_exists('imagecreatefromjpeg');
+ case 'image/png':
+ return function_exists('imagecreatefrompng');
+ case 'image/gif':
+ return function_exists('imagecreatefromgif');
+ }
+ }
+ return false;
+}
+
+/**
+ * Create new GD image resource with transparency support
+ *
+ * @since 2.9.0
+ *
+ * @param $width
+ * @param $height
+ * @return image resource
+ */
+function wp_imagecreatetruecolor($width, $height) {
+ $img = imagecreatetruecolor($width, $height);
+ if ( is_resource($img) && function_exists('imagealphablending') && function_exists('imagesavealpha') ) {
+ imagealphablending($img, false);
+ imagesavealpha($img, true);
+ }
+ return $img;
+}
+
+/**
+ * API for easily embedding rich media such as videos and images into content.
+ *
+ * @package WordPress
+ * @subpackage Embed
+ * @since 2.9.0
+ */
+class WP_Embed {
+ var $handlers = array();
+ var $post_ID;
+ var $usecache = true;
+ var $linkifunknown = true;
+
+ /**
+ * PHP4 constructor
+ */
+ function WP_Embed() {
+ return $this->__construct();
+ }
+
+ /**
+ * PHP5 constructor
+ */
+ function __construct() {
+ // Hack to get the [embed] shortcode to run before wpautop()
+ add_filter( 'the_content', array(&$this, 'run_shortcode'), 8 );
+
+ // Attempts to embed all URLs in a post
+ if ( get_option('embed_autourls') )
+ add_filter( 'the_content', array(&$this, 'autoembed'), 8 );
+
+ // After a post is saved, invalidate the oEmbed cache
+ add_action( 'save_post', array(&$this, 'delete_oembed_caches') );
+
+ // After a post is saved, cache oEmbed items via AJAX
+ add_action( 'edit_form_advanced', array(&$this, 'maybe_run_ajax_cache') );
+ }
+
+ /**
+ * Process the [embed] shortcode.
+ *
+ * Since the [embed] shortcode needs to be run earlier than other shortcodes,
+ * this function removes all existing shortcodes, registers the [embed] shortcode,
+ * calls {@link do_shortcode()}, and then re-registers the old shortcodes.
+ *
+ * @uses $shortcode_tags
+ * @uses remove_all_shortcodes()
+ * @uses add_shortcode()
+ * @uses do_shortcode()
+ *
+ * @param string $content Content to parse
+ * @return string Content with shortcode parsed
+ */
+ function run_shortcode( $content ) {
+ global $shortcode_tags;
+
+ // Backup current registered shortcodes and clear them all out
+ $orig_shortcode_tags = $shortcode_tags;
+ remove_all_shortcodes();
+
+ add_shortcode( 'embed', array(&$this, 'shortcode') );
+
+ // Do the shortcode (only the [embed] one is registered)
+ $content = do_shortcode( $content );
+
+ // Put the original shortcodes back
+ $shortcode_tags = $orig_shortcode_tags;
+
+ return $content;
+ }
+
+ /**
+ * If a post/page was saved, then output Javascript to make
+ * an AJAX request that will call WP_Embed::cache_oembed().
+ */
+ function maybe_run_ajax_cache() {
+ global $post_ID;
+
+ if ( empty($post_ID) || empty($_GET['message']) || 1 != $_GET['message'] )
+ return;
+
+?>
+<script type="text/javascript">
+/* <![CDATA[ */
+ jQuery(document).ready(function($){
+ $.get("<?php echo admin_url( 'admin-ajax.php?action=oembed-cache&post=' . $post_ID ); ?>");
+ });
+/* ]]> */
+</script>
+<?php
+ }
+
+ /**
+ * Register an embed handler. Do not use this function directly, use {@link wp_embed_register_handler()} instead.
+ * This function should probably also only be used for sites that do not support oEmbed.
+ *
+ * @param string $id An internal ID/name for the handler. Needs to be unique.
+ * @param string $regex The regex that will be used to see if this handler should be used for a URL.
+ * @param callback $callback The callback function that will be called if the regex is matched.
+ * @param int $priority Optional. Used to specify the order in which the registered handlers will be tested (default: 10). Lower numbers correspond with earlier testing, and handlers with the same priority are tested in the order in which they were added to the action.
+ */
+ function register_handler( $id, $regex, $callback, $priority = 10 ) {
+ $this->handlers[$priority][$id] = array(
+ 'regex' => $regex,
+ 'callback' => $callback,
+ );
+ }
+
+ /**
+ * Unregister a previously registered embed handler. Do not use this function directly, use {@link wp_embed_unregister_handler()} instead.
+ *
+ * @param string $id The handler ID that should be removed.
+ * @param int $priority Optional. The priority of the handler to be removed (default: 10).
+ */
+ function unregister_handler( $id, $priority = 10 ) {
+ if ( isset($this->handlers[$priority][$id]) )
+ unset($this->handlers[$priority][$id]);
+ }
+
+ /**
+ * The {@link do_shortcode()} callback function.
+ *
+ * Attempts to convert a URL into embed HTML. Starts by checking the URL against the regex of the registered embed handlers.
+ * If none of the regex matches and it's enabled, then the URL will be given to the {@link WP_oEmbed} class.
+ *
+ * @uses wp_oembed_get()
+ * @uses wp_parse_args()
+ * @uses wp_embed_defaults()
+ * @uses WP_Embed::maybe_make_link()
+ * @uses get_option()
+ * @uses current_user_can()
+ * @uses wp_cache_get()
+ * @uses wp_cache_set()
+ * @uses get_post_meta()
+ * @uses update_post_meta()
+ *
+ * @param array $attr Shortcode attributes.
+ * @param string $url The URL attempting to be embeded.
+ * @return string The embed HTML on success, otherwise the original URL.
+ */
+ function shortcode( $attr, $url = '' ) {
+ global $post;
+
+ if ( empty($url) )
+ return '';
+
+ $rawattr = $attr;
+ $attr = wp_parse_args( $attr, wp_embed_defaults() );
+
+ // Look for known internal handlers
+ ksort( $this->handlers );
+ foreach ( $this->handlers as $priority => $handlers ) {
+ foreach ( $handlers as $id => $handler ) {
+ if ( preg_match( $handler['regex'], $url, $matches ) && is_callable( $handler['callback'] ) ) {
+ if ( false !== $return = call_user_func( $handler['callback'], $matches, $attr, $url, $rawattr ) )
+ return apply_filters( 'embed_handler_html', $return, $url, $attr );
+ }
+ }
+ }
+
+ $post_ID = ( !empty($post->ID) ) ? $post->ID : null;
+ if ( !empty($this->post_ID) ) // Potentially set by WP_Embed::cache_oembed()
+ $post_ID = $this->post_ID;
+
+ // Unknown URL format. Let oEmbed have a go.
+ if ( $post_ID ) {
+
+ // Check for a cached result (stored in the post meta)
+ $cachekey = '_oembed_' . md5( $url . serialize( $attr ) );
+ if ( $this->usecache ) {
+ $cache = get_post_meta( $post_ID, $cachekey, true );
+
+ // Failures are cached
+ if ( '{{unknown}}' === $cache )
+ return $this->maybe_make_link( $url );
+
+ if ( !empty($cache) )
+ return apply_filters( 'embed_oembed_html', $cache, $url, $attr );
+ }
+
+ // Use oEmbed to get the HTML
+ $attr['discover'] = ( apply_filters('embed_oembed_discover', false) && author_can( $post_ID, 'unfiltered_html' ) ) ? true : false;
+ $html = wp_oembed_get( $url, $attr );
+
+ // Cache the result
+ $cache = ( $html ) ? $html : '{{unknown}}';
+ update_post_meta( $post_ID, $cachekey, $cache );
+
+ // If there was a result, return it
+ if ( $html )
+ return apply_filters( 'embed_oembed_html', $html, $url, $attr );
+ }
+
+ // Still unknown
+ return $this->maybe_make_link( $url );
+ }
+
+ /**
+ * Delete all oEmbed caches.
+ *
+ * @param int $post_ID Post ID to delete the caches for.
+ */
+ function delete_oembed_caches( $post_ID ) {
+ $post_metas = get_post_custom_keys( $post_ID );
+ if ( empty($post_metas) )
+ return;
+
+ foreach( $post_metas as $post_meta_key ) {
+ if ( '_oembed_' == substr( $post_meta_key, 0, 8 ) )
+ delete_post_meta( $post_ID, $post_meta_key );
+ }
+ }
+
+ /**
+ * Triggers a caching of all oEmbed results.
+ *
+ * @param int $post_ID Post ID to do the caching for.
+ */
+ function cache_oembed( $post_ID ) {
+ $post = get_post( $post_ID );
+
+ if ( empty($post->ID) || !in_array( $post->post_type, apply_filters( 'embed_cache_oembed_types', array( 'post', 'page' ) ) ) )
+ return;
+
+ // Trigger a caching
+ if ( !empty($post->post_content) ) {
+ $this->post_ID = $post->ID;
+ $this->usecache = false;
+
+ $content = $this->run_shortcode( $post->post_content );
+ if ( get_option('embed_autourls') )
+ $this->autoembed( $content );
+
+ $this->usecache = true;
+ }
+ }
+
+ /**
+ * Passes any unlinked URLs that are on their own line to {@link WP_Embed::shortcode()} for potential embedding.
+ *
+ * @uses WP_Embed::autoembed_callback()
+ *
+ * @param string $content The content to be searched.
+ * @return string Potentially modified $content.
+ */
+ function autoembed( $content ) {
+ return preg_replace_callback( '|^\s*(https?://[^\s"]+)\s*$|im', array(&$this, 'autoembed_callback'), $content );
+ }
+
+ /**
+ * Callback function for {@link WP_Embed::autoembed()}.
+ *
+ * @uses WP_Embed::shortcode()
+ *
+ * @param array $match A regex match array.
+ * @return string The embed HTML on success, otherwise the original URL.
+ */
+ function autoembed_callback( $match ) {
+ $oldval = $this->linkifunknown;
+ $this->linkifunknown = false;
+ $return = $this->shortcode( array(), $match[1] );
+ $this->linkifunknown = $oldval;
+
+ return "\n$return\n";
+ }
+
+ /**
+ * Conditionally makes a hyperlink based on an internal class variable.
+ *
+ * @param string $url URL to potentially be linked.
+ * @return string Linked URL or the original URL.
+ */
+ function maybe_make_link( $url ) {
+ $output = ( $this->linkifunknown ) ? '<a href="' . esc_attr($url) . '">' . esc_html($url) . '</a>' : $url;
+ return apply_filters( 'embed_maybe_make_link', $output, $url );
+ }
+}
+$wp_embed = new WP_Embed();
+
+/**
+ * Register an embed handler. This function should probably only be used for sites that do not support oEmbed.
+ *
+ * @since 2.9.0
+ * @see WP_Embed::register_handler()
+ */
+function wp_embed_register_handler( $id, $regex, $callback, $priority = 10 ) {
+ global $wp_embed;
+ $wp_embed->register_handler( $id, $regex, $callback, $priority );
+}
+
+/**
+ * Unregister a previously registered embed handler.
+ *
+ * @since 2.9.0
+ * @see WP_Embed::unregister_handler()
+ */
+function wp_embed_unregister_handler( $id, $priority = 10 ) {
+ global $wp_embed;
+ $wp_embed->unregister_handler( $id, $priority );
+}
+
+/**
+ * Create default array of embed parameters.
+ *
+ * @since 2.9.0
+ *
+ * @return array Default embed parameters.
+ */
+function wp_embed_defaults() {
+ if ( !empty($GLOBALS['content_width']) )
+ $theme_width = (int) $GLOBALS['content_width'];
+
+ $width = get_option('embed_size_w');
+
+ if ( !$width && !empty($theme_width) )
+ $width = $theme_width;
+
+ if ( !$width )
+ $width = 500;
+
+ return apply_filters( 'embed_defaults', array(
+ 'width' => $width,
+ 'height' => 700,
+ ) );
+}
+
+/**
+ * Based on a supplied width/height example, return the biggest possible dimensions based on the max width/height.
+ *
+ * @since 2.9.0
+ * @uses wp_constrain_dimensions() This function passes the widths and the heights.
+ *
+ * @param int $example_width The width of an example embed.
+ * @param int $example_height The height of an example embed.
+ * @param int $max_width The maximum allowed width.
+ * @param int $max_height The maximum allowed height.
+ * @return array The maximum possible width and height based on the example ratio.
+ */
+function wp_expand_dimensions( $example_width, $example_height, $max_width, $max_height ) {
+ $example_width = (int) $example_width;
+ $example_height = (int) $example_height;
+ $max_width = (int) $max_width;
+ $max_height = (int) $max_height;
+
+ return wp_constrain_dimensions( $example_width * 1000000, $example_height * 1000000, $max_width, $max_height );
+}
+
+/**
+ * Attempts to fetch the embed HTML for a provided URL using oEmbed.
+ *
+ * @since 2.9.0
+ * @see WP_oEmbed
+ *
+ * @uses _wp_oembed_get_object()
+ * @uses WP_oEmbed::get_html()
+ *
+ * @param string $url The URL that should be embeded.
+ * @param array $args Addtional arguments and parameters.
+ * @return string The original URL on failure or the embed HTML on success.
+ */
+function wp_oembed_get( $url, $args = '' ) {
+ require_once( 'class-oembed.php' );
+ $oembed = _wp_oembed_get_object();
+ return $oembed->get_html( $url, $args );
+}
+
+/**
+ * Adds a URL format and oEmbed provider URL pair.
+ *
+ * @since 2.9.0
+ * @see WP_oEmbed
+ *
+ * @uses _wp_oembed_get_object()
+ *
+ * @param string $format The format of URL that this provider can handle. You can use asterisks as wildcards.
+ * @param string $provider The URL to the oEmbed provider.
+ * @param boolean $regex Whether the $format parameter is in a regex format or not.
+ */
+function wp_oembed_add_provider( $format, $provider, $regex = false ) {
+ require_once( 'class-oembed.php' );
+ $oembed = _wp_oembed_get_object();
+ $oembed->providers[$format] = array( $provider, $regex );
+}