PHP - Manual: Ds\Deque::first
2024-12-21
(PECL ds >= 1.0.0)
Ds\Deque::first — Returns the first value in the deque
此函数没有参数。
The first value in the deque.
UnderflowException if empty.
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)