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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.

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

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Line Code
1501           if ( !$post =& get_post( $mime ) )
1502                return false;
1503           $post_id = (int) $post->ID;
1504           $mime = $post->post_mime_type;
1505      }
1506
1507      if ( empty($mime) )
1508           return false;
1509
1510      $icon_dir = apply_filters( 'icon_dir', get_template_directory() . '/images' );
1511      $icon_dir_uri = apply_filters( 'icon_dir_uri', get_template_directory_uri() . '/images' );
1512
1513      $types = array(
1514           substr($mime, 0, strpos($mime, '/')),
1515           substr($mime, strpos($mime, '/') + 1),
1516           str_replace('/', '_', $mime)
1517      );
1518
1519      $exts = array('jpg', 'gif', 'png');