<?php
class Deque{
private $queue=array();
function addFirst($item){//头入队
return array_unshift($this->queue,$item);
}
function addLast($item){//尾入队
return array_push($this->queue,$item);
}
function removeFirst(){//头出队
return array_shift($this->queue);
}
function removeLast(){//尾出队
return array_pop($this->queue);
}
function show(){//显示
echo implode(" ",$this->queue);
}
function clear(){//清空
unset($this->queue);
}
function getFirst(){
return array_shift($this->queue);
}
function getLast(){
return array_pop($this->queue);
}
function getLength(){
return count($this->queue);
}
}
$q=new Deque();
$q->addFirst(1);
$q->addLast(5);
$q->removeFirst();
$q->removeLast();
$q->addFirst(2);
$q->addLast(4);
$q->show();
