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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
1881           $src_file = wp_basename($src);
1882      } elseif ( wp_attachment_is_image( $post->ID ) ) {
1883           // We have an image without a thumbnail
1884
1885           $src = wp_get_attachment_url( $post->ID );
1886           $src_file = & $file;
1887      } elseif ( $src = wp_mime_type_icon( $post->ID ) ) {
1888           // No thumb, no image. We'll look for a mime-related icon instead.
1889
1890           $icon_dir = apply_filters( 'icon_dir', get_template_directory() . '/images' );
1891           $src_file = $icon_dir . '/' . wp_basename($src);
1892      }
1893
1894      if ( !isset($src) || !$src )
1895           return false;
1896
1897      return array($src, $src_file);
1898 }
1899