100 lines
2.8 KiB
PHP
100 lines
2.8 KiB
PHP
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<?php
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/**
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* WordPress Post Thumbnail Template Functions.
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*
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* Support for post thumbnails
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* Themes function.php must call add_theme_support( 'post-thumbnails' ) to use these.
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*
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* @package WordPress
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* @subpackage Template
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*/
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/**
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* Check if post has an image attached.
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*
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* @since 2.9.0
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*
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* @param int $post_id Optional. Post ID.
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* @return bool Whether post has an image attached.
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*/
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function has_post_thumbnail( $post_id = null ) {
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return (bool) get_post_thumbnail_id( $post_id );
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}
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/**
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* Retrieve Post Thumbnail ID.
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*
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* @since 2.9.0
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*
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* @param int $post_id Optional. Post ID.
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* @return int
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*/
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function get_post_thumbnail_id( $post_id = null ) {
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$post_id = ( null === $post_id ) ? get_the_ID() : $post_id;
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return get_post_meta( $post_id, '_thumbnail_id', true );
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}
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/**
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* Display Post Thumbnail.
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*
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* @since 2.9.0
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*
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* @param int $size Optional. Image size. Defaults to 'post-thumbnail', which theme sets using set_post_thumbnail_size( $width, $height, $crop_flag );.
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* @param string|array $attr Optional. Query string or array of attributes.
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*/
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function the_post_thumbnail( $size = 'post-thumbnail', $attr = '' ) {
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echo get_the_post_thumbnail( null, $size, $attr );
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}
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/**
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* Update cache for thumbnails in the current loop
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*
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* @since 3.2
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*
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* @param object $wp_query Optional. A WP_Query instance. Defaults to the $wp_query global.
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*/
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function update_post_thumbnail_cache( $wp_query = null ) {
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if ( ! $wp_query )
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$wp_query = $GLOBALS['wp_query'];
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if ( $wp_query->thumbnails_cached )
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return;
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$thumb_ids = array();
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foreach ( $wp_query->posts as $post ) {
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if ( $id = get_post_thumbnail_id( $post->ID ) )
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$thumb_ids[] = $id;
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}
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if ( ! empty ( $thumb_ids ) ) {
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_prime_post_caches( $thumb_ids, false, true );
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}
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$wp_query->thumbnails_cached = true;
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}
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/**
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* Retrieve Post Thumbnail.
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*
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* @since 2.9.0
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*
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* @param int $post_id Optional. Post ID.
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* @param string $size Optional. Image size. Defaults to 'post-thumbnail'.
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* @param string|array $attr Optional. Query string or array of attributes.
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*/
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function get_the_post_thumbnail( $post_id = null, $size = 'post-thumbnail', $attr = '' ) {
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$post_id = ( null === $post_id ) ? get_the_ID() : $post_id;
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$post_thumbnail_id = get_post_thumbnail_id( $post_id );
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$size = apply_filters( 'post_thumbnail_size', $size );
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if ( $post_thumbnail_id ) {
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do_action( 'begin_fetch_post_thumbnail_html', $post_id, $post_thumbnail_id, $size ); // for "Just In Time" filtering of all of wp_get_attachment_image()'s filters
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if ( in_the_loop() )
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update_post_thumbnail_cache();
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$html = wp_get_attachment_image( $post_thumbnail_id, $size, false, $attr );
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do_action( 'end_fetch_post_thumbnail_html', $post_id, $post_thumbnail_id, $size );
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} else {
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$html = '';
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}
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return apply_filters( 'post_thumbnail_html', $html, $post_id, $post_thumbnail_id, $size, $attr );
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}
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