PHP tutorial: OOP


OOP in PHP

Object-oriented programming is a method that allows programmers to use classes and objects to store and structure their programs. In PHP and other object-oriented programming languages such as C++, Java, C#, Small talk, or Ruby, classes, objects, and their relationships are the core of object-oriented programming. Class is a template that can be used to create an object. Therefore, object is the instance of the class.

Creating a class and object


      To create a class, you must use class keyword followed by the name of the class. The objects of the class can be created by using new keyword.
Example: create a class named Employee
 
class Employee
{


}

 

A class can have members. The members can be data members and method members. Data members can be private, protected, and public. A private member can only accessed in the class that defines it. A protected member is accessible in the class and its derived class. A public member can be accessed in code outside the class that defines it.

To define a method member, you need to use function keyword.
 
Example:

<?php

class Employee
{
//data members
private $emp_id;
private $emp_name;
private $emp_sex;
private $emp_salary;
//method members
function setName(){
$this->emp_name="Dara Yuk";
}
function getName(){
return $this->emp_name;

}
}

$emp=new Employee();//create object
$emp->setName();//accessing setName method member
echo $emp->getName();//accessing getName method member
?>

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