Introduction to PHP

PHP(Hypertext Preprocessor) is widely used as server sripting language developed by Rasmus Lerdorf in the year 1994. It is very popular for developing web applications.

Key features

Open-source.
Powerful tool for making dynamic and interactive web pages
Can integrate with almost all popular databases like MySQL, PostgreSQL, Oracle, Sybase, Informix, Microsoft SQL Server etc.
C like Syntax and easy to learn.
Object oriented scripting language.
Easily embeddable into HTML
Loosely typed language.
Faster compared to other scripting languages.
It can access and set cookies in browsers.
Platform independent.

Installation

Installation on Windows, Linux, MacOS

Documentation of the installation guidelines is provided in the official PHP website. Follow the link for installation instructions.

Using OneCompiler

You don't need to install any software or compiler.
Just goto OneCompiler and choose the programming language as Php and enjoy programming without any installation.

Sample Program

<?php
	echo "Hello, world!!!!"
?>

Check Result here

echo : echo is used to output data to the console/screen.
print : print is also used to output data to the screen. Both echo and print are more or less same with small differences, echo doesn't have a return value but print has a return value. echo can have multiple arguments but print takes only one argument. Echo is faster than print comparatively.
// : single line comment
# : Single line comment
/* */ : Multi line comment