php session management

1. Cookie

1. How to get the value in cookie?

Example jumps to a.php through index.php to get the corresponding value jason with the key name;

index.php code:

<?php //设置cookie的键值对
setcookie(&#39;name&#39;,&#39;jason&#39;);
setcookie(&#39;mm&#39;,&#39;mark&#39;);
//跳转页面
header(&#39;Location:a.php&#39;);

a.php code;

<?php //获取cookie的相应键对应的值
echo $_COOKIE[&#39;name&#39;];

in Firefox Browser execution result:

2. How to access cookies through javascript?

Example displays results through pop-up box

<?php //设置cookie的键值对
setcookie(&#39;name&#39;,&#39;jason&#39;);
setcookie(&#39;mm&#39;,&#39;mark&#39;);
?>



    <meta charset="UTF-8">
    <title>cookie知识点</title>
    <script>
        //用js获取cookie
        alert(document.cookie);
    </script>

in index.php:

3. If the browser or user has disabled cookies, how to pass parameters between pages?

Example passes the value of b.php to c.php through URL parameters;

b.php code:

<?php header(&#39;Location:c.php?name=rose&#39;);

c.php code:

<?php echo $_GET[&#39;name&#39;];

can obtain the corresponding value through $_GET The value of the key rose.

二.session:

1. Each time the browser is reopened, the server will assign a new session_id value to the client.

<?php //启用session
session_start();
//访问session_id
echo session_id();

2. How to get the value corresponding to the session key?

Example jumps to a.php through index.php to display the value corresponding to the corresponding key of the session:

index.php code;

<?php //启用session
session_start();
//设置session的键值对
$_SESSION[&#39;name&#39;]=&#39;aili&#39;;
//跳转页面
header(&#39;Location:a.php&#39;);

a.php code:

<?php //启用session
session_start();
//获取session相应键对应的值
if(isset($_SESSION[&#39;name&#39;])){
    echo $_SESSION[&#39;name&#39;];
}else{
    echo &#39;no name found&#39;;
}

The last page jump The successful transfer shows: aili

3. What should I do if I want to destroy the session? (ps application scenario: clear login status after timeout)

PHP provides session_destroy() to destroy the session.

Insert session_destroy() in index.php:

<?php //启用session
session_start();
//设置session的键值对
$_SESSION[&#39;name&#39;]=&#39;aili&#39;;
//销毁session
session_destroy();
//跳转页面
header(&#39;Location:a.php&#39;);

and then perform the operation. After jumping to the page, the result is: no name found.

The above introduces the session management of PHP, including various aspects. I hope it will be helpful to friends who are interested in PHP tutorials.