What Is a Session?

A session is a logical object created by the PHP engine to allow you to preserve data across subsequent HTTP requests.

There is only one session object available to your PHP scripts at any time. Data saved to the session by a script can be retrieved by the same script or another script when requested from the same visitor.

Sessions are commonly used to store temporary data to allow multiple PHP pages to offer a complete functional transaction for the same visitor.

What is PHP

PHP is a scripting language which originally  was stood for Personal Home Page by Rasmus Lerdorf(1994)

after modifications by Andi Gutmans and Zeev Suraski(1997)

 

it changed to PHP: hypertext  preprocessor.It is free software .

The PHP Hypertext Preprocessor is a programming language that allows web developers to create dynamic content that interacts with databases. PHP is basically used for developing web based software applications.