Ds\Deque::first
(PECL ds >= 1.0.0)
Ds\Deque::first — Returns the first value in the deque
说明
public Ds\Deque::first(): mixedReturns the first value in the deque.
参数
此函数没有参数。
返回值
The first value in the deque.
错误／异常
UnderflowException if empty.
范例
示例 #1 Ds\Deque::first() example
<?php
$deque = new \Ds\Deque([1, 2, 3]);
var_dump($deque->first());
?>
以上例程的输出类似于：
int(1)
User Contributed Notes
There are no user contributed notes for this page.官方地址：https://www.php.net/manual/en/ds-deque.first.php