--- a/wp/wp-includes/post-thumbnail-template.php Tue Jun 09 11:14:17 2015 +0000
+++ b/wp/wp-includes/post-thumbnail-template.php Mon Oct 14 17:39:30 2019 +0200
@@ -13,25 +13,30 @@
* Check if post has an image attached.
*
* @since 2.9.0
+ * @since 4.4.0 `$post` can be a post ID or WP_Post object.
*
- * @param int $post_id Optional. Post ID.
- * @return bool Whether post has an image attached.
+ * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`.
+ * @return bool Whether the post has an image attached.
*/
-function has_post_thumbnail( $post_id = null ) {
- return (bool) get_post_thumbnail_id( $post_id );
+function has_post_thumbnail( $post = null ) {
+ return (bool) get_post_thumbnail_id( $post );
}
/**
- * Retrieve Post Thumbnail ID.
+ * Retrieve post thumbnail ID.
*
* @since 2.9.0
+ * @since 4.4.0 `$post` can be a post ID or WP_Post object.
*
- * @param int $post_id Optional. Post ID.
- * @return int
+ * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`.
+ * @return string|int Post thumbnail ID or empty string.
*/
-function get_post_thumbnail_id( $post_id = null ) {
- $post_id = ( null === $post_id ) ? get_the_ID() : $post_id;
- return get_post_meta( $post_id, '_thumbnail_id', true );
+function get_post_thumbnail_id( $post = null ) {
+ $post = get_post( $post );
+ if ( ! $post ) {
+ return '';
+ }
+ return get_post_meta( $post->ID, '_thumbnail_id', true );
}
/**
@@ -48,8 +53,9 @@
*
* @see get_the_post_thumbnail()
*
- * @param string|array $size Optional. Registered image size to use, or flat array of height
- * and width values. Default 'post-thumbnail'.
+ * @param string|array $size Optional. Image size to use. Accepts any valid image size, or
+ * an array of width and height values in pixels (in that order).
+ * Default 'post-thumbnail'.
* @param string|array $attr Optional. Query string or array of attributes. Default empty.
*/
function the_post_thumbnail( $size = 'post-thumbnail', $attr = '' ) {
@@ -57,11 +63,13 @@
}
/**
- * Update cache for thumbnails in the current loop
+ * Update cache for thumbnails in the current loop.
*
* @since 3.2.0
*
- * @param object $wp_query Optional. A WP_Query instance. Defaults to the $wp_query global.
+ * @global WP_Query $wp_query
+ *
+ * @param WP_Query $wp_query Optional. A WP_Query instance. Defaults to the $wp_query global.
*/
function update_post_thumbnail_cache( $wp_query = null ) {
if ( ! $wp_query )
@@ -94,24 +102,33 @@
* size is used by default, though a different size can be specified instead as needed.
*
* @since 2.9.0
+ * @since 4.4.0 `$post` can be a post ID or WP_Post object.
*
- * @param int $post_id Post ID. Default is the ID of the `$post` global.
- * @param string|array $size Optional. Registered image size to use, or flat array of height
- * and width values. Default 'post-thumbnail'.
+ * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`.
+ * @param string|array $size Optional. Image size to use. Accepts any valid image size, or
+ * an array of width and height values in pixels (in that order).
+ * Default 'post-thumbnail'.
* @param string|array $attr Optional. Query string or array of attributes. Default empty.
+ * @return string The post thumbnail image tag.
*/
-function get_the_post_thumbnail( $post_id = null, $size = 'post-thumbnail', $attr = '' ) {
- $post_id = ( null === $post_id ) ? get_the_ID() : $post_id;
- $post_thumbnail_id = get_post_thumbnail_id( $post_id );
+function get_the_post_thumbnail( $post = null, $size = 'post-thumbnail', $attr = '' ) {
+ $post = get_post( $post );
+ if ( ! $post ) {
+ return '';
+ }
+ $post_thumbnail_id = get_post_thumbnail_id( $post );
/**
- * Filter the post thumbnail size.
+ * Filters the post thumbnail size.
*
* @since 2.9.0
+ * @since 4.9.0 Added the `$post_id` parameter.
*
- * @param string $size The post thumbnail size.
+ * @param string|array $size The post thumbnail size. Image size or array of width and height
+ * values (in that order). Default 'post-thumbnail'.
+ * @param int $post_id The post ID.
*/
- $size = apply_filters( 'post_thumbnail_size', $size );
+ $size = apply_filters( 'post_thumbnail_size', $size, $post->ID );
if ( $post_thumbnail_id ) {
@@ -122,11 +139,12 @@
*
* @since 2.9.0
*
- * @param string $post_id The post ID.
- * @param string $post_thumbnail_id The post thumbnail ID.
- * @param string $size The post thumbnail size.
+ * @param int $post_id The post ID.
+ * @param string $post_thumbnail_id The post thumbnail ID.
+ * @param string|array $size The post thumbnail size. Image size or array of width
+ * and height values (in that order). Default 'post-thumbnail'.
*/
- do_action( 'begin_fetch_post_thumbnail_html', $post_id, $post_thumbnail_id, $size );
+ do_action( 'begin_fetch_post_thumbnail_html', $post->ID, $post_thumbnail_id, $size );
if ( in_the_loop() )
update_post_thumbnail_cache();
$html = wp_get_attachment_image( $post_thumbnail_id, $size, false, $attr );
@@ -136,25 +154,102 @@
*
* @since 2.9.0
*
- * @param string $post_id The post ID.
- * @param string $post_thumbnail_id The post thumbnail ID.
- * @param string $size The post thumbnail size.
+ * @param int $post_id The post ID.
+ * @param string $post_thumbnail_id The post thumbnail ID.
+ * @param string|array $size The post thumbnail size. Image size or array of width
+ * and height values (in that order). Default 'post-thumbnail'.
*/
- do_action( 'end_fetch_post_thumbnail_html', $post_id, $post_thumbnail_id, $size );
+ do_action( 'end_fetch_post_thumbnail_html', $post->ID, $post_thumbnail_id, $size );
} else {
$html = '';
}
/**
- * Filter the post thumbnail HTML.
+ * Filters the post thumbnail HTML.
*
* @since 2.9.0
*
- * @param string $html The post thumbnail HTML.
- * @param string $post_id The post ID.
- * @param string $post_thumbnail_id The post thumbnail ID.
- * @param string $size The post thumbnail size.
- * @param string $attr Query string of attributes.
+ * @param string $html The post thumbnail HTML.
+ * @param int $post_id The post ID.
+ * @param string $post_thumbnail_id The post thumbnail ID.
+ * @param string|array $size The post thumbnail size. Image size or array of width and height
+ * values (in that order). Default 'post-thumbnail'.
+ * @param string $attr Query string of attributes.
*/
- return apply_filters( 'post_thumbnail_html', $html, $post_id, $post_thumbnail_id, $size, $attr );
+ return apply_filters( 'post_thumbnail_html', $html, $post->ID, $post_thumbnail_id, $size, $attr );
+}
+
+/**
+ * Return the post thumbnail URL.
+ *
+ * @since 4.4.0
+ *
+ * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`.
+ * @param string|array $size Optional. Registered image size to retrieve the source for or a flat
+ * array of height and width dimensions. Default 'post-thumbnail'.
+ * @return string|false Post thumbnail URL or false if no URL is available.
+ */
+function get_the_post_thumbnail_url( $post = null, $size = 'post-thumbnail' ) {
+ $post_thumbnail_id = get_post_thumbnail_id( $post );
+ if ( ! $post_thumbnail_id ) {
+ return false;
+ }
+ return wp_get_attachment_image_url( $post_thumbnail_id, $size );
+}
+
+/**
+ * Display the post thumbnail URL.
+ *
+ * @since 4.4.0
+ *
+ * @param string|array $size Optional. Image size to use. Accepts any valid image size,
+ * or an array of width and height values in pixels (in that order).
+ * Default 'post-thumbnail'.
+ */
+function the_post_thumbnail_url( $size = 'post-thumbnail' ) {
+ $url = get_the_post_thumbnail_url( null, $size );
+ if ( $url ) {
+ echo esc_url( $url );
+ }
}
+
+/**
+ * Returns the post thumbnail caption.
+ *
+ * @since 4.6.0
+ *
+ * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`.
+ * @return string Post thumbnail caption.
+ */
+function get_the_post_thumbnail_caption( $post = null ) {
+ $post_thumbnail_id = get_post_thumbnail_id( $post );
+ if ( ! $post_thumbnail_id ) {
+ return '';
+ }
+
+ $caption = wp_get_attachment_caption( $post_thumbnail_id );
+
+ if ( ! $caption ) {
+ $caption = '';
+ }
+
+ return $caption;
+}
+
+/**
+ * Displays the post thumbnail caption.
+ *
+ * @since 4.6.0
+ *
+ * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`.
+ */
+function the_post_thumbnail_caption( $post = null ) {
+ /**
+ * Filters the displayed post thumbnail caption.
+ *
+ * @since 4.6.0
+ *
+ * @param string $caption Caption for the given attachment.
+ */
+ echo apply_filters( 'the_post_thumbnail_caption', get_the_post_thumbnail_caption( $post ) );
+}