• OOP's stands for Object Oriented Programming System.


• PHP is not an object-oriented language because OOP wasn't added until PHP 3.


• When PHP 5 was released in July 2004,the path of classes and objects work in PHP was changed originally.


• PHP 4 objects are disability with those designed for PHP 5.


• PHP 6 handles objects is same to PHP 5.


• Object Oriented Programming(OOP) is technique to design your application.


• You can create Modular Web Application with the help of OOP.

Benefits of OOP

• Reusability : An object is an entity which has collection of properties and methods which can interact with other objects.


• Refactoring :OOP provide the maximum benefit because all objects are small entities and contain its properties and methods as a part of itself.


• Maintenance :Object Oriented code is easier to maintain because it follows coding strict conventions .


• Efficiency :Object Oriented programming is developed for better efficiency and ease of development process.Some design patterns are developed to create better and efficient code.

Class

• A class is simply a representation of a type of object.


• It is the blueprint/ plan/ template that describe the details of an object.


• Class is known as fundamental building block of all object-oriented code.


• A variable associated with a class is referred to as a property,and a function is called a method.


• It is collection of related variables and functions, all wrapped up in a pair of curly braces and labeled with the name of the class.

Syntax :

class
{
   //properties defined here.
   //methods defined here.  
}
			 

Example :

<?php 
class First
{
function add()
{
$var1=10;
$var2=20;
$var=$var1+$var2;
echo "$var";	
}
}
?>

Object

• An Object is a real world entity.


• An object can be considered a "thing" that can perform a set of related activities.


• you want to create an instance(object) of the class by using the new keyword like this:

$obj = new First();

Example :

<?php 
class First
 {
  function add() 
   { 
    $var1=10; 
    $var2=20;
    $var=$var1+$var2; 
    echo "$var"; 
   } 
 } 
$obj=new First();//creates an object called $obj
$obj->add();
?>

Output :

30