What is session control and http protocol? How to use it?-PHP Problem-php.cn

What is session control and http protocol? How to use it?

慕斯

Release： 2023-03-10 14:56:01

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The previous article introduced you to "What is PhpSpreadsheet?" how to use? 》, this article continues to introduce to you what is session control and http protocol? How to use it? (Code attached) has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

What is session control and http protocol? How to use it?

Session control

1. What is a session

In reality, two A conversation between individuals is a conversation.
In a computer, the communication between the client and the server is a session.

#2. What is session control

Control of the session is session control

3, HTTP protocol?

HTTP is called a stateless tracking protocol and cannot have any state tracking

Working principle:

HTTP is based on the client-server model and is connection-oriented. A typical HTTP transaction process has the following process

The client establishes a connection with the server;
The client makes a request to the server;
The server accepts the request and returns the corresponding file as a response according to the request;
The client is connected to the server.

Let’s take the code as an example (login page)

<!DOCTYPE html> 
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<form action= "login . php" method="post">
用户名: <input type="text" name= "name" id=""><br/>
密码:
     <input type=" password" name="pwd" id=""><br/> 
     <input type="submit" value="登录">
</form>
</body>
</html>

Copy after login

The running results are as follows:

What is session control and http protocol? How to use it?

Then we create a new file (login.php)

First we need to get the user name and password entered by the user, and secondly, we query whether the user is stored in the data.

How should we query:

//$sq1 = "SELECT id FROM user WHERE
name=用户输入的用户名&&
pwd=等于用户输入的密码加密后的字符串”;
//有数据密码正确登录成功
//没有数据提示用户名或密码错 误
请注册

Copy after login

Let’s take the code as an example:

<?php 
  var_dump($_POST);
?>

Copy after login

The running results are as follows:

What is session control and http protocol? How to use it?

If the code is as follows, let’s take a look at the running results:

<?php 
  var_dump($_POST);
if($_POST[&#39;name&#39;] == &#39;我爱你&#39; && $_POST[&#39;pwd&#39;] == &#39;admin&#39;){
//登录成功
echo &#39;<script>
alert("登录成功"); location="./index.php"</script>&#39;;
}else{
//登录失 败跳转注册页面
}
?>

Copy after login

The running results are as follows:

What is session control and http protocol? How to use it?

Then we After creating a file (index.php), we start to make the home page of the project: then when we log in successfully, we start to make the card, that is, in login.php, we take the inserted code as an example,

//制作卡片
setCookie(&#39;islogin&#39;，true ,time()+3600,&#39;/&#39;);
setCookie(&#39;name&#39; ,$_POST[&#39;name&#39;],time()+3600,&#39;/&#39;);

Copy after login

The information in all our cards can be queried in the cookie

<?php
    //这是项目的首页
    var_dump($_COOKIE);
?>

Copy after login

After we finish running, we can add the if conditional sentence to the index page,

<?php
    //这是项目的首页
    //var_dump($_COOKIE);
    if($_COOKIE[&#39; islogin&#39;] != true){ 
        //用户没有登录
        echo &#39; 对不起，您无权访问3S后自动跳转到登录页面&#39; ;
        echo &#39;<meta http-equiv="refresh"
              content= "3;url=./login. html">&#39;;
        }else{
        //代表用户已经登录
        echo &#39;亲爱的&#39;. $_COOKIE[&#39;name&#39;].&#39;会员，欢迎您回来<br/>&#39; ;
        echo &#39;<a href="a . php">去a页面</a><brF>&#39;;
        echo &#39;<a href="b . php">去b页面</a><br/>&#39;;
        echo &#39;<a href="c . php">去c页面</a><br/>&#39;;
        }
?>

Copy after login

The running result As follows:

What is session control and http protocol? How to use it?

Recommended learning: "PHP Video Tutorial"

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