Ds\Deque::first
(PECL ds >= 1.0.0)
Ds\Deque::first — Returns 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.
示例
示例 #1 Ds\Deque::first() example
<?php
$deque = new \Ds\Deque([1, 2, 3]);
var_dump($deque->first());
?>以上示例的输出类似于：
int(1)
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