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update_post_thumbnail_cache › WordPress Function
Since3.2.0
Deprecatedn/a
› update_post_thumbnail_cache ( $wp_query = null )
Parameters: |
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Defined at: |
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Codex: |
Updates cache for thumbnails in the current loop.
Related Functions: update_postmeta_cache, update_post_cache, update_post_author_caches, update_post_caches, the_post_thumbnail
Source
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();
/*
* $wp_query may contain an array of post objects or post IDs.
*
* This ensures the cache is primed for all post objects to avoid
* `get_post()` calls in `get_the_post_thumbnail()` triggering an
* additional database call for each post.
*/
$parent_post_ids = array();
foreach ( $wp_query->posts as $post ) {
if ( $post instanceof WP_Post ) {
$parent_post_ids[] = $post->ID;
} elseif ( is_int( $post ) ) {
$parent_post_ids[] = $post;
}
}
_prime_post_caches( $parent_post_ids, false, true );
foreach ( $wp_query->posts as $post ) {
$id = get_post_thumbnail_id( $post );
if ( $id ) {
$thumb_ids[] = $id;
}
}
if ( ! empty( $thumb_ids ) ) {
_prime_post_caches( $thumb_ids, false, true );
}
$wp_query->thumbnails_cached = true;
}