Reversing a Singly LinkedList

reverseLinkedList.php

<?php

function reverseLinkedList($l){
	
	if($l == null){
		return $l;
	}
	
	$reverse = clone $l;
	$reverse->next = null;
	
	while($l->next != null){
		$l = $l->next;
		$tmp = clone $l;
		$tmp->next = $reverse;
		$reverse = $tmp;
		unset($tmp);
	}
	
	return $reverse;
}