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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
1906      } elseif ( wp_attachment_is_image( $post->ID ) ) {
1907           // We have an image without a thumbnail.
1908
1909           $src = wp_get_attachment_url( $post->ID );
1910           $src_file = & $file;
1911      } elseif ( $src = wp_mime_type_icon( $post->ID ) ) {
1912           // No thumb, no image. We'll look for a mime-related icon instead.
1913
1914           /** This filter is documented in wp-includes/post.php */
1915           $icon_dir = apply_filters( 'icon_dir', get_template_directory() . '/images' );
1916           $src_file = $icon_dir . '/' . wp_basename($src);
1917      }
1918
1919      if ( !isset($src) || !$src )
1920           return false;
1921
1922      return array($src, $src_file);
1923 }
1924