get_the_post_thumbnail( int|WP_Post $post = null, string|array $size = ‘post-thumbnail’, string|array $attr = ” )
Retrieve the post thumbnail.
Description Description
When a theme adds ‘post-thumbnail’ support, a special ‘post-thumbnail’ image size is registered, which differs from the ‘thumbnail’ image size managed via the Settings > Media screen.
When using the_post_thumbnail() or related functions, the ‘post-thumbnail’ image size is used by default, though a different size can be specified instead as needed.
Parameters Parameters
- $post
-
(int|WP_Post) (Optional) Post ID or WP_Post object. Default is global
$post.Default value: null
- $size
-
(string|array) (Optional) Image size to use. Accepts any valid image size, or an array of width and height values in pixels (in that order).
Default value: ‘post-thumbnail’
- $attr
-
(string|array) (Optional) Query string or array of attributes.
Default value: ”
Return Return
(string) The post thumbnail image tag.
More Information More Information
If the required add_theme_support( 'post-thumbnails' ); in the current theme’s functions.php file is attached to a hook, it must be must be called before the init hook is fired. The init hook may be too late for some features. If attached to a hook, it must be after_setup_theme.
Source Source
File: wp-includes/post-thumbnail-template.php
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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( $post ); /** * Filters the post thumbnail size. * * @since 2.9.0 * @since 4.9.0 Added the `$post_id` parameter. * * @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, $post->ID ); if ( $post_thumbnail_id ) { /** * Fires before fetching the post thumbnail HTML. * * Provides "just in time" filtering of all filters in wp_get_attachment_image(). * * @since 2.9.0 * * @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 ); if ( in_the_loop() ) { update_post_thumbnail_cache(); } $html = wp_get_attachment_image( $post_thumbnail_id, $size, false, $attr ); /** * Fires after fetching the post thumbnail HTML. * * @since 2.9.0 * * @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 ); } else { $html = ''; } /** * Filters the post thumbnail HTML. * * @since 2.9.0 * * @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 );} |
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Changelog Changelog
| Version | Description |
|---|---|
| 4.4.0 | $post can be a post ID or WP_Post object. |
| 2.9.0 | Introduced. |