Knowledge points related to user login in PHP (2)

This article mainly introduces the relevant knowledge points about implementing user login in PHP (2). It has certain reference value. Now I share it with everyone. Friends in need can refer to it

3.4 Successful jump--PHP session technology3.4.1 Why should we have session technology

The characteristics of HTTP protocol are stateless/connectionless. When a browser requests the same web server multiple times in succession, the server cannot distinguish whether multiple operations come from the same browser (user).

Session technology is to find a way through the HTTP protocol to allow the server to identify multiple requests from the same browser, so that the browser (user) can continue to access the same website multiple times. No additional authentication is required.

3.4.2 The difference between session and cookie

##1. Security aspects    

Session is stored on the server side, with high security. Cookies are stored on the browser side, with low security.

2. In terms of data size, the number and size of cookies are limited (20/4K) and there is no limit to session data storage

3. Available data types Cookie can only store simple data, values/strings Session can store complex data (automatic serialization)

4. In terms of storage location, the cookie is saved on the browser and the session is saved on the server.

##3.4.3 Record the session after successful login

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//开启session session_start(); //存储登录信息 $_SESSION['user']=""; //验证用户是否登录 判断是否存在$_SESSION['user'] if(!$_SESSION['USER']){ }

4.PHP常用的跳转方法-heade

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方法一： header("location:跳转url"); //直接跳转不带有提示信息 header("refresh:秒;url=新地址"); //延时跳转 注意：header前不能有任何输出语句

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关于PHP实现用户登录相关知识点（一）

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