Source View: post_thumbnail_html

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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
89      if ( $post_thumbnail_id ) {
90           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
91           if ( in_the_loop() )
92                update_post_thumbnail_cache();
93           $html = wp_get_attachment_image( $post_thumbnail_id, $size, false, $attr );
94           do_action( 'end_fetch_post_thumbnail_html', $post_id, $post_thumbnail_id, $size );
95      } else {
96           $html = '';
97      }
98      return apply_filters( 'post_thumbnail_html', $html, $post_id, $post_thumbnail_id, $size, $attr );
99 }
100