I am trying to create a function on a button (server side) but it is returning error. Here is a simple example: Button SUM SERVER SIDE $num01 = 10; $num02 = 30; $result["sum"] = calcSum($num01,$num02); function calcSum($num01,$num02){ return ($num01 + $num02);
} The error message is: "Call to undefined function calcSum() in ....\buttonhandler.php on line ..."