41a46,73
>
> /**
>  * Invoke a hook_printapi() operation in all modules.
>  *
>  * @param &$node
>  *   A node object.
>  * @param $op
>  *   A string containing the name of the nodeapi operation.
>  * @param $a3, $a4
>  *   Arguments to pass on to the hook, after the $node and $op arguments.
>  * @return
>  *   The returned value of the invoked hooks.
>  */
> function print_invoke_printapi(&$node, $op, $a3 = NULL, $a4 = NULL) {
>   $return = array();
>   foreach (module_implements('printapi') as $name) {
>     $function = $name .'_printapi';
>     $result = $function($node, $op, $a3, $a4);
>     if (isset($result) && is_array($result)) {
>       $return = array_merge($return, $result);
>     }
>     else if (isset($result)) {
>       $return[] = $result;
>     }
>   }
>   return $return;
> }
>
619a652,653
>
>   print_invoke_printapi($node, 'alter');