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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
1882           $src_file = wp_basename($src);
1883      } elseif ( wp_attachment_is_image( $post->ID ) ) {
1884           // We have an image without a thumbnail.
1885
1886           $src = wp_get_attachment_url( $post->ID );
1887           $src_file = & $file;
1888      } elseif ( $src = wp_mime_type_icon( $post->ID ) ) {
1889           // No thumb, no image. We'll look for a mime-related icon instead.
1890
1891           $icon_dir = apply_filters( 'icon_dir', get_template_directory() . '/images' );
1892           $src_file = $icon_dir . '/' . wp_basename($src);
1893      }
1894
1895      if ( !isset($src) || !$src )
1896           return false;
1897
1898      return array($src, $src_file);
1899 }
1900