OOPS in PHP: December 2013

Friday, 20 December 2013

Constructor

Constructor is a built in function of an object.Constructors are allow us to initialize an object's properties.

Example:

<?php
class pencilbox {
var$name;
function __construct($name)
{
$this->name = $name;
}
function set_name($name)
{
$this->name = $name;
}

function get_name()
{
return $this->name;
}

} ?>

Explanation:

When we are instantiating a class (Creating an object),a property will be passed to the class.
Here $name is the property.

Wednesday, 11 December 2013

Object

Objects are instances of a class.So the process of instantiating the class provides an object.We can create unlimited times of objects with a class.
           When we are creating an object... that is instantiating a class starts with a keyword of 'new'.

Example:

             <?php     include("myclass.php");    ?>

              <head>

                
              </head>
              <body>
              <?php
   $pen=new pencilbox();
?>
               </body>
Explanation:

First include the class file
Then call instantiating function where you need it in the program....
Here $pen is the object instantiated from the class pencilbox().

Wednesday, 4 December 2013

Class

Definition:

Classes are user defined data types.
Classes are collection of objects which are in similar datatype.
We can create any number of objects under a single class.
Class has 2 main parts
        1.Properties:
                   Properties are nothing but simple variables.
        2.Methods:
                   Methods are functions of classes,used to manipulate data/variables/properties.

Sample code:1

class pencilbox()
{
             var $type;

             function set_type($mytype)
                {
   $this->type=$mytype;
                 }

}

Explanation:

Here we are creating a class with the name pencilbox .
$type-Property
function set_type($mytype)-Method

Sample code :2

               class pencilbox()
{
             var $type;

             function set_type($mytype)
                {
   $this->type=$mytype;
                 }
            function get_type()
                {
return   $this->type;
                 }

}

Explanation:

Setter method is used to set a property.[function set_type($mytype)]
Getter method is used to get a property [function get_type()]
$this : is a builtin variable which points to the current. property.[$this->property name]

Object oriented programing

OOP in php is about creating a modular code like other languages(java......).OOP makes it easy to maintain and modifying the existing code.

Concepts of oops:

Classes
Objects
Data Abstraction and Encapsulation
Inheritance
Polymorphism

Before entering into the concepts , create 2 files named index.php,myclass.php.