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 );
+
+ /**
+ * Filter the post thumbnail size.
+ *
+ * @since 2.9.0
+ *
+ * @param string $size The post thumbnail size.
+ */
$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
+
+ /**
+ * Fires before fetching the post thumbnail HTML.
+ *
+ * Provides "just in time" filtering of all filters in wp_get_attachment_image().
+ *
+ * @since 2.9.0
+ *
+ * @param string $post_id The post ID.
+ * @param string $post_thumbnail_id The post thumbnail ID.
+ * @param string $size The post thumbnail size.
+ */
+ do_action( 'begin_fetch_post_thumbnail_html', $post_id, $post_thumbnail_id, $size );
if ( in_the_loop() )
update_post_thumbnail_cache();
$html = wp_get_attachment_image( $post_thumbnail_id, $size, false, $attr );
+
+ /**
+ * Fires after fetching the post thumbnail HTML.
+ *
+ * @since 2.9.0
+ *
+ * @param string $post_id The post ID.
+ * @param string $post_thumbnail_id The post thumbnail ID.
+ * @param string $size The post thumbnail size.
+ */
do_action( 'end_fetch_post_thumbnail_html', $post_id, $post_thumbnail_id, $size );
+
} else {
$html = '';
}
+ /**
+ * Filter the post thumbnail HTML.
+ *
+ * @since 2.9.0
+ *
+ * @param string $html The post thumbnail HTML.
+ * @param string $post_id The post ID.
+ * @param string $post_thumbnail_id The post thumbnail ID.
+ * @param string $size The post thumbnail size.
+ * @param string $attr Query string of attributes.
+ */
return apply_filters( 'post_thumbnail_html', $html, $post_id, $post_thumbnail_id, $size, $attr );
}