Passing a parameter from a parent to a child function

Question

I'm trying to pass a parameter from a parent function to a child function while keeping the child function parameterless. I tried the following but it doesn't seem to work.

public static function parent($param)
{
    function child()
    {
        global $param;

        print($param) // prints nothing
    }
}

Answer 1

You can use lambda functions from PHP 5.3 and on:

public static function parent($param) {
  $child = function($param) {
    print($param);
  }

  $child($param);
}

If you need to do it with earlier versions of PHP try create_function.

Answer 2

I think that the global you call in child() does not refer to that scope. Try running it with really global variable.