100 lines
2.8 KiB
PHP
100 lines
2.8 KiB
PHP
<?php
|
|
/**
|
|
* WordPress Post Thumbnail Template Functions.
|
|
*
|
|
* Support for post thumbnails
|
|
* Themes function.php must call add_theme_support( 'post-thumbnails' ) to use these.
|
|
*
|
|
* @package WordPress
|
|
* @subpackage Template
|
|
*/
|
|
|
|
/**
|
|
* Check if post has an image attached.
|
|
*
|
|
* @since 2.9.0
|
|
*
|
|
* @param int $post_id Optional. Post ID.
|
|
* @return bool Whether post has an image attached.
|
|
*/
|
|
function has_post_thumbnail( $post_id = null ) {
|
|
return (bool) get_post_thumbnail_id( $post_id );
|
|
}
|
|
|
|
/**
|
|
* Retrieve Post Thumbnail ID.
|
|
*
|
|
* @since 2.9.0
|
|
*
|
|
* @param int $post_id Optional. Post ID.
|
|
* @return int
|
|
*/
|
|
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 );
|
|
}
|
|
|
|
/**
|
|
* Display Post Thumbnail.
|
|
*
|
|
* @since 2.9.0
|
|
*
|
|
* @param int $size Optional. Image size. Defaults to 'post-thumbnail', which theme sets using set_post_thumbnail_size( $width, $height, $crop_flag );.
|
|
* @param string|array $attr Optional. Query string or array of attributes.
|
|
*/
|
|
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
|
|
*
|
|
* @param object $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 Post Thumbnail.
|
|
*
|
|
* @since 2.9.0
|
|
*
|
|
* @param int $post_id Optional. Post ID.
|
|
* @param string $size Optional. Image size. Defaults to 'post-thumbnail'.
|
|
* @param string|array $attr Optional. Query string or array of attributes.
|
|
*/
|
|
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 );
|
|
$size = apply_filters( 'post_thumbnail_size', $size );
|
|
if ( $post_thumbnail_id ) {
|
|
do_action( 'begin_fetch_post_thumbnail_html', $post_id, $post_thumbnail_id, $size ); // for "Just In Time" filtering of all of wp_get_attachment_image()'s filters
|
|
if ( in_the_loop() )
|
|
update_post_thumbnail_cache();
|
|
$html = wp_get_attachment_image( $post_thumbnail_id, $size, false, $attr );
|
|
do_action( 'end_fetch_post_thumbnail_html', $post_id, $post_thumbnail_id, $size );
|
|
} else {
|
|
$html = '';
|
|
}
|
|
return apply_filters( 'post_thumbnail_html', $html, $post_id, $post_thumbnail_id, $size, $attr );
|
|
}
|