--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/web/wp-includes/media.php Wed Dec 23 17:55:33 2009 +0000
@@ -0,0 +1,796 @@
+<?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);
+}
+
+?>