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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
821  */
822 function wp_get_attachment_image_src( $attachment_id, $size = 'thumbnail', $icon = false ) {
823      // get a thumbnail or intermediate image if there is one
824      $image = image_downsize( $attachment_id, $size );
825      if ( ! $image ) {
826           $src = false;
827
828           if ( $icon && $src = wp_mime_type_icon( $attachment_id ) ) {
829                /** This filter is documented in wp-includes/post.php */
830                $icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/media' );
831
832                $src_file = $icon_dir . '/' . wp_basename( $src );
833                @list( $width, $height ) = getimagesize( $src_file );
834           }
835
836           if ( $src && $width && $height ) {
837                $image = array( $src, $width, $height );
838           }
839      }