class Program {
	private callback $condition = bool(int $x) { return ($x > 100); };
	private int[] $numbers = {34, 56, 22, 1, 5, 67, 897, 123, 55, 101};

	int[] filter(callback $condition, int[] $numbers) {
		int $len = sizeof($numbers);
		int[] $filtered;
		for(int $i = 0; $i < $len; $i++) {
			if($condition($numbers[$i])) {
				$filtered[] = $numbers[$i];
			}
		}
		return $filtered;
	}

	public void main() {
		int[] $filtered = $this->filter($this->condition, $this->numbers);
		var_dump($filtered);
	}

}