Course Intermediate  11250

Course Introduction："Self-study IT Network Linux Load Balancing Video Tutorial" mainly implements Linux load balancing by performing script operations on web, lvs and Linux under nagin.

Course Advanced  17583

Course Introduction："Shangxuetang MySQL Video Tutorial" introduces you to the process from installing to using the MySQL database, and introduces the specific operations of each link in detail.

Course Advanced  11299

Course Introduction："Brothers Band Front-end Example Display Video Tutorial" introduces examples of HTML5 and CSS3 technologies to everyone, so that everyone can become more proficient in using HTML5 and CSS3.

Course Introduction： 为什么要判断isset后还要判断empty，直接判断empty不是代码更少吗？if(isset($_SERVER['HTTP_RANGE']) && !empty($_SERVER['HTTP_RANGE'])){}------解决思路----------------------先isset是为了防止empty发警告。

2016-06-13 comment 0  936

Course Introduction：为什么要判断isset后还要判断empty，直接判断empty不是代码更少吗？

2016-06-23 comment 0  755

Course Introduction：In PHP programming, we often need to determine whether a variable has been set. This prevents programs from causing errors when using unset variables. In order to achieve this purpose, we usually use the isset() function to judge. The isset() function is used to determine whether a variable has been set and is not null. If the variable has been set and is not null, the function returns true; otherwise it returns false. Here is an example using the isset() function: $var=&q

2023-06-27 comment 0  1109

Course Introduction： php 5.4中新增加对session状态判断的功能   在以前的php 版本中,要判断session是否有效,只能用如下的方法: session_start(); if(isset($_SESSION)) { echo "Started"; } else { echo "Not Start

2016-06-13 comment 0  940

Course Introduction：This article will explain in detail how PHP determines whether a specified key exists in an array. The editor thinks it is very practical, so I share it with you as a reference. I hope you can gain something after reading this article. PHP determines whether a specified key exists in an array: In PHP, there are many ways to determine whether a specified key exists in an array: 1. Use the isset() function: isset($array["key"]) This function returns a Boolean value, true if the specified key exists, false otherwise. 2. Use array_key_exists() function: array_key_exists("key",$arr

2024-03-21 comment 0  579