Is there a function like the magic method __call() for global scope in php?

If a call is made to an undefined method in a class, the magic method __call can intercept the call, so I could handle the situation as I see fit: http://www.php.net/manual/en/language.oop5.overloading.php#language.oop5.overloading.methods

Is there any mechanism provided in php whereby I can do the same thing with functions in global scope. The point is best illustrated with code:

    <?php
    function return_some_array(){
      $a = array();
      //Do stuff to array
      return array();
    }

    // Now i call the function like so:
    $give_me_array = return_some_array();

    // But sometimes I want the array to not contain zeroes, nulls etc.
    // so I call: 
    $give_me_array_filtered = return_some_array_filtered();

    // But i haven't defined return_some_array_filtered() anywhere.
    // Instead I would like to do something like so: 
    function __magic_call($function_name_passed_automatically){ 
      preg_match('/(.*)_filtered$/', $function_name_passed_automatically, $matches);
      $function_name_that_i_defined_earlier_called_return_some_array = $matches[1];
      if($matches){
        $result = call_user_func($function_name_that_i_defined_earlier_called_return_some_array);
        $filtered = array_filter($result);
        return $filtered;
      }
    }

    //So now, I could call return_some_other_array_filtered() and it would work provided I had defined return_some_other_array().
    //Or even Donkey_filtered() would work, provided I had defined Donkey() somewhere.
    ?>

Is this at all possible?