PHP Session Development Principles and Detailed Usage-PHP Tutorial-php.cn

PHP Session Development Principles and Detailed Usage

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Release： 2023-03-22 14:42:01

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PHP Session Development Principles and Detailed Usage

Store a user's information, change the user session settings, and all pages can be used. This article mainly shares with you the principles of PHP Session development and detailed usage instructions. I hope it can help you.

PHP Session variable

Open the program, make some changes, then save and exit. It's just a session. The server can know who is operating through the session.
Working mechanism: Create a uid for the visitor, store variables according to this uid, the uid is stored in a cookie, or URL transmission.

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Use PHP Session

Start the session before storing user information in the session
Note: The session_start() function must be located before the <html> tag:

<?php
 session_start(); 
 ?><html><body></body></html>

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Register the user session with the server , convenient for saving user information, and assigning a uid to the user session

Storage Session variable

To store and obtain session, use $_SESSION

<?phpsession_start();// 存储 session 数据if(isset($_SESSION[&#39;views&#39;]))
{    $_SESSION[&#39;views&#39;]=$_SESSION[&#39;views&#39;]+1;
}else{    $_SESSION[&#39;views&#39;]=9999;
}?><html><head><meta charset="utf-8"></head><body><?php// 检索 session 数据echo "浏览量：". $_SESSION[&#39;views&#39;];?></body></html>

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Output "Views: 9999"

Destroy Session

Which unset() or session_destroy() function is used to destroy

<?phpsession_start();if(isset($_SESSION[&#39;views&#39;]))
{    //释放指定的 session 变量
    unset($_SESSION[&#39;views&#39;]);
}//彻底销毁 sessionsession_destroy();?>

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Function: Store a user's information, change user session settings, and can be used on all pages.

PHP Session variable

Use PHP Session

Save user information before the session and start the session
Note: The session_start() function must be located before the <html> tag:

<?php
 session_start(); 
 ?><html><body></body></html>

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Storage Session variable

Store and obtain session using $ _SESSION

<?phpsession_start();// 存储 session 数据if(isset($_SESSION[&#39;views&#39;]))
{    $_SESSION[&#39;views&#39;]=$_SESSION[&#39;views&#39;]+1;
}else{    $_SESSION[&#39;views&#39;]=9999;
}?><html><head><meta charset="utf-8"></head><body><?php// 检索 session 数据echo "浏览量：". $_SESSION[&#39;views&#39;];?></body></html>

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Output "Views: 9999"

Destroy Session

Which one to useunset() or session_destroy() Function destruction

<?phpsession_start();if(isset($_SESSION[&#39;views&#39;]))
{    //释放指定的 session 变量
    unset($_SESSION[&#39;views&#39;]);
}//彻底销毁 sessionsession_destroy();?>

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