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What are the advantages of using sessions in PHP?

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What are the advantages of using sessions in PHP?

PHP benefits of storing session data in database

  • Limit the number of logins. For instance if your application should allow only 10 logins at a time , then the session table can be checked to find the number of users already logged in.
  • Block multiple logins for same username.
  • Monitor user activity.
  • Logout a user.

Why sessions are needed?

It allows the server to manage session state; e.g. if a user suspects somebody is logged in as them on another device, they can invalidate all other sessions (“log me out everywhere” functionality). You may be storing a lot of data, and sending it back and forth in a cookie on every request can become rather wasteful.

What is the purpose of the PHP session ID?

Sessions and PHP PHP allows us to track each visitor via a unique session ID which can be used to correlate data between connections. This id is a random string sent to the user when a session is created and is stored within the user’s browser in a cookie (by default called PHPSESSID).

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How does a PHP session work?

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.

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.

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.

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How do Sessions work?

Websites use a session ID to respond to user interactions during a web session. To track sessions, a web session ID is stored in a visitor’s browser. This session ID is passed along with any HTTP requests that the visitor makes while on the site (e.g., clicking a link).

What are HTTP sessions?

HTTP sessions is an industry standard feature that allows Web servers to maintain user identity and to store user-specific data during multiple request/response interactions between a client application and a Web application.

How is session ID used?

A session ID is a unique number that a Web site’s server assigns a specific user for the duration of that user’s visit (session). Every time an Internet user visits a specific Web site, a new session ID is assigned. Closing a browser and then reopening and visiting the site again generates a new session ID.

Can PHP session be hacked?

Sessions are NOT serverside, they are stored on the clients local machine (you can go in your cookies and look for a cookie called phpssid under your domain name). Yes they can be hacked, and this is in fact a very common method of hacking.

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How many sessions can PHP handle?

1000+ sessions can still be perfectly handled by standard PHP file based sessions. If you notice that is getting a problem, you can exchange the session backend easily. There are pluggable session handlers for memcached or other memory or database based storage systems.

How long is a PHP session?

Default php. ini sets the session expiration time to 30 minutes. As long as the browser have the cookie stored, it doesn’t matter if it is closed or is open.