* @return bool Whether post has an image attached.
*/
function has_post_thumbnail( $post_id = null ) {
- $post_id = ( null === $post_id ) ? get_the_ID() : $post_id;
return (bool) get_post_thumbnail_id( $post_id );
}
echo get_the_post_thumbnail( null, $size, $attr );
}
+/**
+ * Update cache for thumbnails in the current loop
+ *
+ * @since 3.2
+ */
+function update_post_thumbnail_cache() {
+ global $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 ) ) {
+ get_posts( array(
+ 'update_post_term_cache' => false,
+ 'include' => $thumb_ids,
+ 'post_type' => 'attachment',
+ 'post_status' => 'inherit',
+ 'nopaging' => true
+ ) );
+ }
+
+ $wp_query->thumbnails_cached = true;
+}
+
/**
* Retrieve Post Thumbnail.
*
$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 {