what are the real time applications of php

Answer 1

With PHP, you can make al sorts of things, facebook was originally written in PHP.

Answer 2

PHP is originally designed for HTTP which is not suitable for real time applications. HTTP works with client requests and server responses.
However there are libraries for PHP which extend its functionality by Websockets. Websockets enable real time data exchange between client and server and design of rich internet applications interacting in real time (e. g. chats, games etc.).

Answer 3

IT acts as a interface between ur HTML page and sql(database)
for eg :do you know any website login page whether it is Facebook or Gmail so I enter the name and password
so the work of php is to give the name or check the information about the name and password in data base
if there exists such user it will grant u access