Detailed explanation of how to use php session_PHP tutorial

This article will introduce to you PHP beginners about the basic usage of global variable session in PHP. Friends who need to know more can refer to it.

What is Session

Session refers to a series of actions or information that has a beginning and an end. For example, the entire process of going to a movie from entering the theater to walking out of the theater can be called a Session. Cookies store data on the client computer, while Sessions store variable variables on the server side.

Every user will generate a Session after connecting to the website server, so you must first tell the server to use the Session function to store data. There are two ways to enable the Session function:

1. Use the session_start() function to start the session. Its structure is as follows:

session_start()
The function cannot take parameters and its return value is Boolean.

2. Set the parameter session.auto_start in php.ini and set this parameter to 1, that is, the Session function will be automatically enabled when connected to the server.

After starting the Session, you must first register the variable before using the Session variable, and then you can use it. On the contrary, if you do not use a variable, you must unregister it. Session_register (variable name) can register a Session variable; Session_unregister (variable name) can unregister a Session variable, for example:

The code is as follows

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代码如下	复制代码
session_start(); /* 启动session变量 */ session_register('user') /* 注册user变量 */ session_unregister('user') /* 注销user变量 */

session_start(); /* Start session variable */

session_register('user') /* Register user variable */ session_unregister('user') /* Unregister user variable */

Call session variable

代码如下	复制代码
$_SESSION['$string']=$str;

How to use php session: Use the function $_SESSION[] to create a function variable with the following format:

The code is as follows	Copy code
$_SESSION['$string']=$str;

代码如下	复制代码
session_start(); $_SESSION['name']="Jane"; $_SESSION['password']="888888"; echo "用户名是： " .$_SESSION['name'] ." ";  echo "密码是： " .$_SESSION['password'] ." "; ?>

The parameter $string is the variable name to be defined, and $str is the variable value. Use the format of $_SESSION[$string] when calling.

Example:

The code is as follows

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session_start();

$_SESSION['name']="Jane";

$_SESSION['password']="888888";

echo "The username is: " .$_SESSION['name'] ."
";

代码如下	复制代码
session_start(); /* 启动session */ $_SESSION['name']="LIMing"; $_SESSION['password']="888888"; $_SESSION['time']=time(); echo "传递session " ?>

echo "The password is: " .$_SESSION['password'] ."
"; ?>

Use of session This site introduced some concepts and basic operations of session earlier. Here we introduce the method of using php session through examples. Example code:

The code is as follows	Copy code
session_start(); /* Start session */<🎜> $_SESSION['name']="LIMing";<🎜> $_SESSION['password']="888888";<🎜> $_SESSION['time']=time();<🎜> echo "pass session " ?>

session.php code:

代码如下	复制代码
session_start();  echo "用户名是：" .$_COOKIE['name'] ." ";  echo "密码是：" .$_SESSION['password'] ." ";  echo "访问时间是：" .date('Y m d H:i:s', $_SESSION['time']) ." "; ?>

Get the value of session_id

Each session will be assigned a specific id, identified by session_id. We can view the value of the current session_id through the session_id() function, whose structure is as follows:

session_id()

Example:

Cookies are created using the client. When a user opens a website with a browser, a cookie will be created for the user. This process is performed by the user's computer, and the website's server just sends some instructions. Therefore, if the user disables the cookie function, cookies cannot be used to implement related functions.

The code is as follows

代码如下	复制代码
session_start(); /* 启动session */ $id=session_id(); /* 获取当前session_id */ echo "当前sessionID是： " .$id; ?>

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session_start(); /* Start session */
$id=session_id(); /* Get the current session_id */
echo "The current sessionID is: " .$id;
?>

The difference between cookie and session

Session and cookies are both important session management applications and are used in many PHP development projects. Their function is to create different values ​​for different users, so that different users can return different results.

So what is the difference between session cookies?

Session is created using the server. The entire process is executed by the server, and the user has no right to intervene.

When using it, if you want to save server resources, you can choose cookies for session management; if you want all viewers to be able to use session management, you should choose sessions. http://www.bkjia.com/PHPjc/633073.htmlwww.bkjia.comtrue

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This article will introduce to you PHP beginners the basic usage of the global variable session session in PHP. Friends who need to know can enter for reference. What is Session? Session is...