1. Hypertext Preprocessor
PHP
Hypertext Preprocessor

2. Introduction
PHP is a server side scripting language that is embedded in HTML.
It is used to manage dynamic content, databases, session tracking, even build entire e-commerce sites.

3. Object oriented concepts
PHP
Object oriented concepts

4. PHP Classes
<?php class phpClass { var $var1; var $var2 = "constant string"; function myfunc ($arg1, $arg2) { [..] } ?>

5. PHP Constructor
PHP provides a special function called __construct() to define a constructor. You can pass as many as arguments you like into the constructor function.

6. PHP destructor
Like a constructor function you can define a destructor function using function __destruct(). You can release all the resources with-in a destructor.

7. Dynamic Websites with PHP
The Websites provide the functionalities that can use to store, update, retrieve, and delete the data in a database.

8. Validation
Validation means check the input submitted by the user. There are two types of validation are available in PHP. They are as follows −
Client-Side Validation − Validation is performed on the client machine web browsers.
Server Side Validation − After submitted by data, The data has sent to a server and perform validation checks in server machine.