Question

I have written a function:

function url_query(){
  if (is_numeric($_GET['cmd'])) {
    $get = $_GET['cmd'];
  }
  return $get;
}

but I want that this function be global. This function works only for eg.

index.php?cmd=...

Can I revise this function to use for index.php?page=… and index.php?catID=… etc?
Thanks

Answer 1

function url_query($param){
  $get = null;
  if (isset($_GET[$param]) && is_numeric($_GET[$param])) {
    $get = $_GET[$param];
  }
  return $get;
}

I’ve ensured that the return value is null if the parameter is not numeric, so that client code has to explicitly check for that case.