Detailed explanation of method examples of creating session in php, detailed explanation of session_PHP tutorial

Detailed explanation of method examples of php creating session, detailed explanation of session

The example in this article describes how to create a session in PHP. Share it with everyone for your reference. The specific analysis is as follows:

Saving a session only requires two steps, opening the session and saving the session data. By default, the session is saved in the c:windowstemp folder on the server side (the saved path can be modified in the php.ini file: turn on session.save_path and fill in the saved path).

session creation code

Copy code The code is as follows:

echo "------How to save session data---------
";
//1. Initialize session
session_start();
//2. Save data. The data types that can be saved include: string, integer, double, array, object, etc.
$_SESSION['name']="Baidu";//Save string
$_SESSION['age']=80;//Save integer

//Save the array
$arr = array("name"=>"Xiao Chen","age"=>25,"job"=>"Programmer");
$_SESSION['person'] = $arr;

//Save object
class Dog{
public $name;
public $age;
public $color;
function __construct($name,$age,$color){
$this->name=$name;
$this->age=$age;
$this->color=$color;
}
}
$dog = new Dog("Puppy",2,"Yellow");
$_SESSION['dog'] = $dog;

echo "save successfully";
?>

Under the C:windowstemp file, find a file to save the session and open it as shown below:

Instructions:

(1) Each session is separated by a semicolon;
(2) Take the first session as an example: name represents the key value, s represents the string (correspondingly: i represents the integer, a represents the array, o represents the object, etc.), 4 represents the length, and "Baidu" represents the key value.

Detailed knowledge (very important):

(1) Each session (that is, open a browser to visit a website, and the session ends when the browser is closed) corresponds to a session file;
(2) The session file is created when session_start() is executed, but at this time, the file is empty. If there is session data, it will be written to the file;
(3) The default retention time of session data is 1440 seconds. This time is the daze time, that is, during this period, the session file has not been used (if it has been used, the modification time of the file will be automatically updated - right-click You can see it by looking at the file properties). This default value can be modified in the php.ini file: session.gc_maxlifetime = 1440;
(4) Top priority: When the server returns the client browser request, it will return the session information (such as: PHPSESSID=0pk6fmamnk1btcgbcf444dnd76) to the browser in the form of a cookie (Similarly, you can use httpwatch to capture the packet to view ). When the browser visits other pages of the website, the cookie information will be sent to the server according to http coordination. The server then finds the corresponding session file based on this information (the corresponding file name is: sess_0pk6fmamnk1btcgbcf444dnd76).

I hope this article will be helpful to everyone’s PHP programming design.

http://www.bkjia.com/PHPjc/948407.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/948407.htmlTechArticleDetailed example of how to create a session in PHP. Detailed explanation of session. This article explains how to create a session in PHP. Share it with everyone for your reference. The specific analysis is as follows: Saving the session only requires two...