1 
     queue, $obj); 8         } 9         10         public function frontRemove() {11             return array_shift($this->queue);12         }13         14         public function rearAdd($obj) {15             array_push($this->queue, $obj);16         }17         18         public function rearRemove() {19             return array_pop($this->queue);20         }21         22         public function size() {23             return count($queue);24         }25     }26     27     $deque = new Deque();28     $deque->rearAdd(2);29     $deque->rearAdd(2);30     $deque->frontAdd(1);31     $deque->frontAdd(1);32     $deque->rearAdd(2);33     $deque->rearAdd(2);34     print_r($deque);35     $deque->frontRemove();36     $deque->rearRemove();37     print_r($deque);38 ?>

Deque Object ( [queue] => Array ( [0] => 1 [1] => 1 [2] => 2 [3] => 2 [4] => 2 [5] => 2 ) ) Deque Object ( [queue] => Array ( [0] => 1 [1] => 2 [2] => 2 [3] => 2 ) )