# Ds\Deque::copy

(PECL ds >= 1.0.0)

Ds\Deque::copy — Returns a shallow copy of the deque

### 说明

public Ds\Deque::copy(): Ds\Deque

Returns a shallow copy of the deque.

### 参数

此函数没有参数。

### 返回值

A shallow copy of the deque.

### 示例

示例 #1 Ds\Deque::copy() example

`<?php
$a = new \Ds\Deque([1, 2, 3]);
$b = $a->copy();
$b->push(4);
print_r($a);
print_r($b);
?>`

以上示例的输出类似于：

    Ds\Deque Object
    (
        [0] => 1
        [1] => 2
        [2] => 3
    )
    Ds\Deque Object
    (
        [0] => 1
        [1] => 2
        [2] => 3
        [3] => 4
    )

`↑` and `↓` to navigate • `Enter` to select • `Esc` to close • `/` to open