Question

Referencing a method parameter variable from within a sub-function of that method doesn’t seem to work even when global is specified.

public function sortArray(&$array, $keyToCompare){// BOOL sortArray( ARR &$array, STR $keyToCompare )
    function cmpVals($pairA, $pairB){
        global $keyToCompare;
        return strcmp($pairA[$keyToCompare], $pairB[$keyToCompare]);
    }
    return uasort($array, 'cmpVals');
}

Is it even possible to reference a method parameter from within a sub-function? If so… how?

For my specific example above I realise I could use a closure to achieve the same goal but I don’t want the script to be PHP 5.3 dependent.

Answer 1

Any reason you can’t make it static?

class YourClassName {
    public static $keyToCompare;
    public function sortArray(&$array, $keyToCompare){// BOOL sortArray( ARR &$array, STR $keyToCompare )
        self::$keyToCompare = $keyToCompare;
        function cmpVals($pairA, $pairB){
            $keyToCompare = YourClassName::$keyToCompare;
            return strcmp($pairA[$keyToCompare], $pairB[$keyToCompare]);
        }
        return uasort($array, 'cmpVals');
    }
}