What does Session mean in PHP?

In PHP, Session is a server-side mechanism that is used to record user-related information so that the user can initiate requests to the Web server again in this capacity. The biggest difference between Session and Cookie is that the latter is Stored on the client side, while the former is stored on the server side.

#Session occupies a very important position in Web technology. Since the web page is a stateless connection program and cannot record the user's browsing status, it is necessary to record the user's relevant information through the Session so that the user can initiate a request to the Web server in this capacity again.

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Session means "session" in Chinese. It is similar to Cookie and is used to store user-related information, such as user name, access permissions, login time, etc. The biggest difference with Cookie is that Cookie stores data on the client computer, while Session stores data on the server system.

When a Session is opened, PHP will create a random Session ID (such as "t5is1r7ct740dn390kuv3mpcse"). Each user's Session ID is unique, and the Session ID is the same as the user's Session data stored on the server. The text files have the same name.

Session ID will be saved in two locations: client and server.

• On the client side, use temporary cookies to save in the directory specified by the browser. The cookie name defaults to "PHPSESSID";

• On the server side, Save it as a text file in the specified Session directory.

By default, this Session ID will be sent to the web browser as a Cookie, and then the PHP page will use this Cookie to access Session information.

Compared with Cookie, Session has the following advantages:

• Generally, Session is more secure because the data in Session does not go back and forth between the client and the server. Repeated delivery;

• Session can store more information than Cookie;

• When the user disables Cookies, some methods can still be used Can keep the Session working normally.

How Session works

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