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How to echo hello world in php

How to echo "Hello World" in Php :-

What is PHP ?
PHP is a server side and secure language which is used to make dynamic and secure webpages

echo "<center><h1>Hello world</h1></center>"; 

How can we write PHP Code?
Generally PHP code does not run in a browser. So we have to install wamp or xamp server in our system.

Some of the website made on PHP are -
1. (Social Networking Website)
2. (Jobs Site)

How to install Wamp server?

We will use Notepad ++ and Google Chrome Browser

<!DOCTYPE html>
echo "My first PHP script!";

Learn How to Set Wamp Server in Windows PC -