Ds\Deque::first

(PECL ds >= 1.0.0)

Ds\Deque::first — Returns the first value in the deque

public Ds\Deque::first(): mixed

Returns the first value in the deque.

此函数没有参数。

The first value in the deque.

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)