How to use php to implement a two-way queue code example
Purpose: Mainly test the function of array
array_pop array_push
array_pop array_pop() 函数删除数组中的最后一个元素。删除尾部一 array_push array_push() 函数向第一个参数的数组尾部添加一个或多个元素(入栈),然后返回新数组的长度。 该函数等于多次调用 $array[] = $value。 尾部塞入一
array_unshift array_shift
array_shift() 函数删除数组中第一个元素,并返回被删除元素的值。 删除头第一 array_unshift() 函数用于向数组插入新元素。新数组的值将被插入到数组的开头。 插入头第一
reset reset() 函数将内部指针指向数组中的第一个元素,并输出。 end end() 函数将数组内部指针指向最后一个元素,并返回该元素的值(如果成功)。
Implementation code:
<?php class Deque { public $queue = array(); /**(尾部)入队 **/ public function addLast($value) { return array_push($this->queue,$value); } /**(尾部)出队**/ public function removeLast() { return array_pop($this->queue); } /**(头部)入队**/ public function addFirst($value) { return array_unshift($this->queue,$value); } /**(头部)出队**/ public function removeFirst() { return array_shift($this->queue); } /**清空队列**/ public function makeEmpty() { unset($this->queue); } /**获取列头**/ public function getFirst() { return reset($this->queue); } /** 获取列尾 **/ public function getLast() { return end($this->queue); } /** 获取长度 **/ public function getLength() { return count($this->queue); } }
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