Explanation on how to use session in thinkphp

When we learn the basics of PHP, we will encounter session session control. I just couldn’t understand it when I was learning it. Later, I figured it out during development. It turned out to be so simple, but the level of understanding may still be Too shallow, today we will talk about how to use session in thinkPHP framework!

The Session class is encapsulated in ThinkPHP and users can use it directly. Commonly used methods are:

• ##Session::set(name, value): Register session.

• Session::is_set(name): Check whether the value of Session is set.

• Session::get(name): Read session.

• Session::clear(): Clear the Session.

• Session::destroy(): Destroy session.

ThinkPHP opens the session session by default, so there is no need to use the session_start() function to open the session before using the Session class.

Use session instance

Next, register the session by submitting the form, and read the session value in the template mode and the Session::get mode in the operation on the other two pages.

Register session

User module sessionTest operation registration session example:

class UserAction extends Action{  
public function session(){  
if(!emptyempty($_POST['username'])){  
Session::set('username',$_POST['username']);  
}  
$this->display();  
}  
}

sessionTest.html template (fragment):

<p>  
< present name="_SESSION[&#39;username&#39;]">{$_SESSION[&#39;username&#39;]} 你好！  
< a href="APP/">首页</a>  
< a href="URL/user">本模块其他页面</a>  
< a href="URL/logout">注销</a><else />请输入您的用户名：  
< /p>  
< form action="SELF" method="post">  
< p><input type="text" name="username" /></p>  
< p><input type="submit" value=" 提交 " /></p>  
< /form>  
< /present>

When filling in the user name (such as testuser), After clicking the submit button, submit to the sessionTest method (i.e., the current page) to process and register the session value. Use

template tag present to control the output logic. It is detected that the $_SESSION['username'] variable has been registered and the output is:

testuser Hello! Home Logout

Otherwise the form will be output.

Detect whether the session is registered

Detect in the template

In the template, you can directly use present or notempty or even switch, etc. The tag determines whether the session variable is registered to decide to output the corresponding session value (directly output the session variable value as an output array unit) or display other page elements. For details, please refer to the template tag part of this tutorial and the above example.

Detection in operation

In operation, you can use the Session::is_set method to check whether the value of Session is set. For example, the operation of User module user is as follows:

public function user(){  
// 由于直接在操作里输出，为避免乱码  header("Content-Type:text/html; charset=utf-8");  
if(Session::is_set('username')){  
echo Session::get('username').' 你好';  
}else{  
echo 'session 未注册';  
}  
}

Other module pages

In other pages (such as Index/index), determine and read the session code snippet:

<present name="_SESSION[&#39;username&#39;]">
{$_SESSION[&#39;username&#39;]} 你好！
<else />未登录
</present>

session 无效(无法传递)

Session may appear in ThinkPHP In the case of invalid (cannot be passed to other pages), the possible reasons are as follows:

The first letter of the Session class is not capitalized, such as: session::set.

The page has information output , such as

The entry file has blank lines, etc.

The session storage path (session.save_path) on the server (Linux/Unix) has incorrect permissions, resulting in the failure to store the session information correctly.

Suggestions for scope issues:

ThinkPHP’s Session class is just a simple wrapper for the session. In fact, you can directly use PHP’s native session function in the operation, as is the official So suggested.

You should also take a look at these:

php session control session, cookie introduction

Detailed explanation of the Sessionid processing mechanism in Laravel

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