PHP Basics

PHP Basics 

What is PHP?

PHP is a server Side language which help to make web application on web.

PHP files can contain text, HTML, CSS, JavaScript, and PHP code

PHP code are executed on the server, and the result is returned to the browser as plain HTML

PHP files have extension ".php"

What PHP Do?

Read,Write File

Executes Sql Queries

Generate Web Pages

Create Web Application

Send and Receive Cookies

Generate Sessions

Encrypt Data

Tools And Environment For PHP

For Environment

To Run PHP file We Need A Web Server You Can Create A free Web Hosting Using http://000webhost.com

Or

By Using Your Local Machine

Xampp is The Best Local Server For Your Machine Run On Window,Linux,Mac

For Android You Can Use Server Like KSweb Server.

For Editor

You Can Use Text Editor Sublime Text,Eclispse For PHP Or Notepad++.

Example 1. Hello World

<?php

echo "Hello World";

?>

Output

Hello World

PHP Syntax

Php Must Start With

<?php and ends with ?>

PHP StateMents End With (;) Semicolon

Comments in PHP

// This is a single-line comment

# This is a single-line comment

/*

This is a multiple-lines comment block

*/

Declare Variable in PHP

Example 2 . Declare Variables

<?php

$txt = "Hello world!"; //Declare txt

$x = 5; //Declare x

$y = 10.5; //Decalare y

?>

Note:- (In PHP Variables Name Are Case Sensitive So $x must Be Different Value Form $X )

PHP echo and print function

Example 3 print and echo example

<?php

echo "This is Printing Function Anything We Will Write Inside echo is Print On Browser Screen";

print "This is Printing Function Anything We Will Write Inside print is Print On Browser Screen";

?>