... PHP 4 >= 4.0.4) get_defined_functions -- Returns an array of all defined functions . ... This function returns an multidimensional array containing a list of all defined functions, both built-in (internal) and user-defined. The internal functions will be accessible via $arr["internal"] , and the user defined ones using $arr["user"] (see example below). function myrow($id, $data) { return "<tr><th>$id</th><td>$data</td></tr>\n"; } $arr = get_defined_functions(); print_r($arr); . ...