Deprecated: Optional parameter $keys declared before required parameter $cms_id is implicitly treated as a required parameter in /home/www/dev/work/class/blog/CmsKey.php on line 75

Deprecated: Creation of dynamic property lvesu\lvesu\controller\blog\php::$title is deprecated in /home/www/dev/work/website/lvesu/class/controller/blog/php.php on line 28

Deprecated: Creation of dynamic property lvesu\lvesu\controller\blog\php::$outlink is deprecated in /home/www/dev/work/website/lvesu/template/blog/cms/php.manual.tpl on line 2

Deprecated: Creation of dynamic property lvesu\lvesu\controller\blog\php::$status is deprecated in /home/www/dev/work/website/lvesu/template/blog/index.head.php on line 2
PHP - Manual: Ds\Deque::first - 互联网笔记

略微加速

PHP官方手册 - 互联网笔记

PHP - Manual: Ds\Deque::first

2025-05-13

Ds\Deque::first

(PECL ds >= 1.0.0)

Ds\Deque::firstReturns the first value in the deque

说明

public Ds\Deque::first(): mixed

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)
添加备注

用户贡献的备注

此页面尚无用户贡献的备注。

官方地址:https://www.php.net/manual/en/ds-deque.first.php

冷却塔厂家 广告
中文GPT4.0无需注册 广告
北京半月雨文化科技有限公司.版权所有 京ICP备12026184号-3