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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
1939           $src_file = basename($src);
1940      } elseif ( wp_attachment_is_image( $post->ID ) ) {
1941           // We have an image without a thumbnail
1942
1943           $src = wp_get_attachment_url( $post->ID );
1944           $src_file = & $file;
1945      } elseif ( $src = wp_mime_type_icon( $post->ID ) ) {
1946           // No thumb, no image. We'll look for a mime-related icon instead.
1947
1948           $icon_dir = apply_filters( 'icon_dir', get_template_directory() . '/images' );
1949           $src_file = $icon_dir . '/' . basename($src);
1950      }
1951
1952      if ( !isset($src) || !$src )
1953           return false;
1954
1955      return array($src, $src_file);
1956 }
1957