PHP case code for user login

This article mainly introduces the case code for implementing user login in PHP. It has certain reference value. Now I share it with everyone. Friends in need can refer to it.

This article describes the implementation of user login in PHP. Case code. Share it with everyone for your reference, the details are as follows:

Requirement analysis:

In web application development, it is often necessary to implement the user login function. Assume a user named username. When the user enters the homepage of the website, if he has not logged in, the page will prompt to log in. The user enters the login information for verification. If the verification passes, he enters the user center. Otherwise, the user name or password is incorrect and he needs to log in again. . After successful login, the user can also click "Logout" to return to the login page.

Programming flow chart:

login.html

 
 
 
  
  
  
 
 
 
 
 
 
  
用户登录
 
  
 
   
 
    用户名: 
     
   
 
   
 
    密码: 
     
   
 
   
 
      
    7天内自动登录 
   
 
   
 
      
     
   
 
  
 
 
 
 
 

##login. php

index.php

"; 
  echo "注销"; 
 } 
 else 
 { //为登录 
  echo "你还未登录，请登录"; 
 } 
?>

logout.php

登录"; 
?>

Login interface:

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PHP implements login verification code verification function

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