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Detailed explanation of PHP session session processing function examples
Detailed explanation of PHP session session processing function examples
This article mainly introduces the relevant information of PHP session session processing function. Friends who need it can refer to it
PHP Session variables
When you run an application, you open it, make changes, and then close it. It's a lot like a session. The computer knows who you are. It knows when you start the application and when it terminates it. But on the Internet, there's a problem: the server doesn't know who you are and what you do, and that's because HTTP addresses don't maintain state.
PHP session solves this problem by storing user information on the server for subsequent use (such as user name, purchased items, etc.). However, session information is temporary and will be deleted after the user leaves the site. If you need to store information permanently, you can store the data in a database.
Session works by creating a unique id (UID) for each visitor and storing variables based on this UID. The UID is stored in a cookie or passed through the URL.
1. Start a session
Before saving information to the session, you must first open the session. PHP provides the session_start() function to start or continue a session. Definition:
1 bool session_start( void )
Call as follows:
##
<?php session_start();?> <html> <body></body> </html>
2. Store or read session
<?php
/**
* Created by PhpStorm.
* User: yuxiu
* Date: //
* Time: :
*/
if(isset($_POST['submit'])){
session_start(); //开始建立一个会话
$_SESSION['season'] = $_POST['season']; //存储会话数据
header("Location: session.php"); //应特别注意header()里的格式问题
}
?>
<b>存储会话</b>
<hr/>
选择需要设置的数据：
<form name="form" method="post" action="" id="form" >
<select name="season" id="season_select" >
<option value="春天">春天</option>
<option value="夏天">夏天</option>
<option value="秋天">秋天</option>
<option value="冬天">冬天</option>
</select>
<br/>
<br/>
<br/>
<input type="submit" name="submit" value="submit"/>
</form>
<?php
/**
* Created by PhpStorm.
* User: yuxiu
* Date: //
* Time: :
*/
session_start(); //建立或者继续一个会话
$season = $_SESSION['season']; //读取会话数据
echo "<b>读取会话</b><br/><br/>";
switch ($season) {
case '春天';
echo '现在是绿意盎然的春天！';
break;
case '夏天';
echo '现在是热情四溢的夏天！';
break;
case '秋天';
echo '现在是丰收果实的秋天!';
break;
case '冬天';
echo '现在是白雪皑皑的冬天!';
break;
default ;
echo '对不起，会话中没有数据 或者 不存在该对话 ！';
}
?>3. Destroy the session
<?php unset($_SESSION['season']); ?>
<?php session_destroy(); //注意，使用这个函数将重置session数组，即失去所有的已经储存的session数据 ?>
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