How does session work in PHP?

What is PHP session and how it works?

In PHP, a session provides a way to store web page visitor preferences on a web server in the form of variables that can be used across multiple pages. … The information is retrieved from the web server when a session is opened at the beginning of each web page. The session expires when the web page is closed.

How is session management done in PHP?

PHP provides a cookie-based implementation for session management. The $_SESSION array is used for storing session data. PHP automatically generates a session ID and sends a session cookie containing this session ID to the client machine.

What is the purpose of session in PHP?

Sessions are a simple way to store data for individual users against a unique session ID. This can be used to persist state information between page requests. Session IDs are normally sent to the browser via session cookies and the ID is used to retrieve existing session data.

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How does PHP keep track of sessions?

The session functions keep track of users by issuing them cookies with a randomly generated session IDs. If PHP detects that a user doesn’t accept the session ID cookie, it automatically adds the session ID to URLs and forms.

Where session is stored?

Structure of a session

The session can be stored on the server, or on the client. If it’s on the client, it will be stored by the browser, most likely in cookies and if it is stored on the server, the session ids are created and managed by the server.

How long does session last?

How long does a session last? By default, a session lasts until there’s 30 minutes of inactivity, but you can adjust this limit so a session lasts from a few seconds to several hours. Learn more about adjusting session settings.

How check session is start or not in PHP?

In PHP,we utilize session_start() an inbuilt function to start the session .


  1. 0 – PHP_SESSION_DISABLED: Sessions are currently disabled.
  2. 1 – PHP_SESSION_NONE: Sessions are enabled, but no session has been started.
  3. 2 – PHP_SESSION_ACTIVE: Sessions are enabled and a session has been started.

How PHP session is created and destroyed?

A PHP session can be destroyed by session_destroy() function. This function does not need any argument and a single call can destroy all the session variables. If you want to destroy a single session variable then you can use unset() function to unset a session variable.

Where are sessions stored PHP?

PHP Default Session Storage (File System): In PHP, by default session data is stored in files on the server. Each file is named after a cookie that is stored on the client computer. This session cookie (PHPSESSID) presumably survives on the client side until all windows of the browser are closed.

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Why do we need session?

A session is a way to store information (in variables) to be used across multiple pages. … Unlike a cookie, the information is not stored on the users computer rather session is stored in server. When you work with an application, you open it, do some changes, and then you close it.

What is session explain with example?

A session is a global variable stored on the server. Each session is assigned a unique id which is used to retrieve stored values. Whenever a session is created, a cookie containing the unique session id is stored on the user’s computer and returned with every request to the server.

How can save session data in PHP?

How to Use Sessions in Your PHP Scripts

  1. Starting a Session. At the beginning of your script, make a call to the session_start() function. …
  2. Storing and Accessing Variables. To store variables relevant to the session, assign what you want to a member of the $_SESSION array. …
  3. Ending a Session.

What is PHP session start?

session_start() creates a session or resumes the current one based on a session identifier passed via a GET or POST request, or passed via a cookie. When session_start() is called or when a session auto starts, PHP will call the open and read session save handlers. … When session.

What is difference between cookies and session?

The main difference between a session and a cookie is that session data is stored on the server, whereas cookies store data in the visitor’s browser. Sessions are more secure than cookies as it is stored in server. Cookie can be turned off from browser.

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Can PHP session work without browser cookies?

Sessions in PHP normally do use cookies to function. But, PHP sessions can also work without cookies in case cookies are disabled or rejected by the browser that the PHP server is trying to communicate with.

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