mirror of
https://github.com/WordPress/WordPress.git
synced 2024-11-05 02:10:45 +01:00
ae5c195d57
Props rzen, desrosj. Fixes #44859. Built from https://develop.svn.wordpress.org/trunk@44542 git-svn-id: http://core.svn.wordpress.org/trunk@44373 1a063a9b-81f0-0310-95a4-ce76da25c4cd
276 lines
8.7 KiB
PHP
276 lines
8.7 KiB
PHP
<?php
|
|
/**
|
|
* WordPress Post Thumbnail Template Functions.
|
|
*
|
|
* Support for post thumbnails.
|
|
* Theme's functions.php must call add_theme_support( 'post-thumbnails' ) to use these.
|
|
*
|
|
* @package WordPress
|
|
* @subpackage Template
|
|
*/
|
|
|
|
/**
|
|
* Determines whether a post has an image attached.
|
|
*
|
|
* For more information on this and similar theme functions, check out
|
|
* the {@link https://developer.wordpress.org/themes/basics/conditional-tags/
|
|
* Conditional Tags} article in the Theme Developer Handbook.
|
|
*
|
|
* @since 2.9.0
|
|
* @since 4.4.0 `$post` can be a post ID or WP_Post object.
|
|
*
|
|
* @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 = null ) {
|
|
$thumbnail_id = get_post_thumbnail_id( $post );
|
|
$has_thumbnail = (bool) $thumbnail_id;
|
|
|
|
/**
|
|
* Filters whether a post has a post thumbnail.
|
|
*
|
|
* @since 5.1.0
|
|
*
|
|
* @param bool $has_thumbnail true if the post has a post thumbnail, otherwise false.
|
|
* @param int|WP_Post|null $post Post ID or WP_Post object. Default is global `$post`.
|
|
* @param int|string $thumbnail_id Post thumbnail ID or empty string.
|
|
*/
|
|
return (bool) apply_filters( 'has_post_thumbnail', $has_thumbnail, $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|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 = null ) {
|
|
$post = get_post( $post );
|
|
if ( ! $post ) {
|
|
return '';
|
|
}
|
|
return get_post_meta( $post->ID, '_thumbnail_id', true );
|
|
}
|
|
|
|
/**
|
|
* Display the post thumbnail.
|
|
*
|
|
* 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.
|
|
*
|
|
* @since 2.9.0
|
|
*
|
|
* @see get_the_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 = '' ) {
|
|
echo get_the_post_thumbnail( null, $size, $attr );
|
|
}
|
|
|
|
/**
|
|
* Update cache for thumbnails in the current loop.
|
|
*
|
|
* @since 3.2.0
|
|
*
|
|
* @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 ) {
|
|
$wp_query = $GLOBALS['wp_query'];
|
|
}
|
|
|
|
if ( $wp_query->thumbnails_cached ) {
|
|
return;
|
|
}
|
|
|
|
$thumb_ids = array();
|
|
foreach ( $wp_query->posts as $post ) {
|
|
if ( $id = get_post_thumbnail_id( $post->ID ) ) {
|
|
$thumb_ids[] = $id;
|
|
}
|
|
}
|
|
|
|
if ( ! empty( $thumb_ids ) ) {
|
|
_prime_post_caches( $thumb_ids, false, true );
|
|
}
|
|
|
|
$wp_query->thumbnails_cached = true;
|
|
}
|
|
|
|
/**
|
|
* Retrieve the post thumbnail.
|
|
*
|
|
* When a theme adds 'post-thumbnail' support, a special 'post-thumbnail' image size
|
|
* is registered, which differs from the 'thumbnail' image size managed via the
|
|
* Settings > Media screen.
|
|
*
|
|
* When using the_post_thumbnail() or related functions, the 'post-thumbnail' image
|
|
* size is used by default, though a different size can be specified instead as needed.
|
|
*
|
|
* @since 2.9.0
|
|
* @since 4.4.0 `$post` can be a post ID or WP_Post object.
|
|
*
|
|
* @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 = 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 );
|
|
}
|
|
|
|
/**
|
|
* 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 ) );
|
|
}
|