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Source View: post_thumbnail_size

To save our bandwidth, we show only a snippet of code around each occurence of the hook. View complete file in SVN (without highlighting).

Understanding Source Code

The best way to understand what a hook does is to look at where it occurs in the source code.

  • Action hooks look like this: do_action( "hook_name" )
  • Filter hooks look like this: apply_filters( "hook_name", "what_to_filter" ).

Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.

Source View

Line Code
56  *
57  * @param int $post_id Optional. Post ID.
58  * @param string $size Optional. Image size.  Defaults to 'thumbnail'.
59  * @param string|array $attr Optional. Query string or array of attributes.
60   */
61 function get_the_post_thumbnail( $post_id = NULL, $size = 'post-thumbnail', $attr = '' ) {
62      global $id;
63      $post_id = ( NULL === $post_id ) ? $id : $post_id;
64      $post_thumbnail_id = get_post_thumbnail_id( $post_id );
65      $size = apply_filters( 'post_thumbnail_size', $size );
66      if ( $post_thumbnail_id ) {
67           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
68           $html = wp_get_attachment_image( $post_thumbnail_id, $size, false, $attr );
69           do_action( 'end_fetch_post_thumbnail_html', $post_id, $post_thumbnail_id, $size );
70      } else {
71           $html = '';
72      }
73      return apply_filters( 'post_thumbnail_html', $html, $post_id, $post_thumbnail_id, $size, $attr );
74 }