Getting Started with PHP Session-PHP Tutorial-php.cn

Getting Started with PHP Session

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Release： 2023-03-22 15:10:01

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This article mainly shares with you a session method for getting started with PHP. It has a good reference value and I hope it will be helpful to everyone. Let’s follow the editor and take a look.

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

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.

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

<?php
session_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

<?php
session_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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