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This article is to share with you about the usefulness of PHP Session. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

PHP Session

The PHP session variable is used to store information about the user session (session) or to change the settings of the user session (session). The Session variable stores information for a single user and is available to all pages in the application.

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PHP Session variable

When you operate an application on your computer, you open it, make some changes, and then close it. It's a lot like a Session. The computer knows who you are. It knows when you open and close the application. However, there is a problem on the Internet: because the HTTP address cannot be maintained, the Web server does not know who you are and what you have done.

PHP session solves this problem by storing user information on the server for later use (such as user name, purchase, etc.). However, the session information is temporary and will be deleted after the user leaves the site. If you need to store information permanently, you can store the data in a database.

Session works by creating a unique id (UID) for each visitor and storing variables based on that UID. UID is stored in cookie or transmitted through URL.

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Start PHP Session

Before you can store user information in PHP session, you must first start the session.

Note: the session_start () function must precede the label

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Store Session variables

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The correct way to store and retrieve session variables is to use the PHP $_ SESSION variable

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Destroy Session

If you want to delete some session data, you can use the unset () or session_destroy () function.

The unset () function is used to release the specified session variable

You can also destroy session completely by calling the session_destroy () function

Note: session_destroy () will reset the session and you will lose all stored session data.

Thank you for reading! This is the end of this article on "what's the use of PHP Session?". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

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