/**
* 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 (true) or not (false).
+ * @return bool Whether post has an image attached.
*/
-function has_post_thumbnail( $post_id = NULL ) {
- global $id;
- $post_id = ( NULL === $post_id ) ? $id : $post_id;
- return !! get_post_thumbnail_id( $post_id );
+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 );
}
/**
* 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 ) {
- global $id;
- $post_id = ( NULL === $post_id ) ? $id : $post_id;
+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 );
+ echo get_the_post_thumbnail( null, $size, $attr );
+}
+
+/**
+ * Update cache for thumbnails in the current loop
+ *
+ * @sicne 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.
- *
+ *
* @since 2.9.0
*
* @param int $post_id Optional. Post ID.
* @param string $size Optional. Image size. Defaults to 'thumbnail'.
* @param string|array $attr Optional. Query string or array of attributes.
- */
-function get_the_post_thumbnail( $post_id = NULL, $size = 'post-thumbnail', $attr = '' ) {
- global $id;
- $post_id = ( NULL === $post_id ) ? $id : $post_id;
+ */
+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 {
return apply_filters( 'post_thumbnail_html', $html, $post_id, $post_thumbnail_id, $size, $attr );
}
-?>
\ No newline at end of file
+?>