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PHP Class Object

Class is a blueprint of related data members(proerties/variable) and methods(function).
Classes are the fundamental construct behind oops.
Class is a self contained independent collection of variables and functions, which work together to perform one or more specific related task.

Note: Variables within a class are called properties and functions are called methods

How to define a class

Class always start with "class" keyword. After this write class name without parentheses. Syntax

class demo

{

code to be executed

}

<?php

class demo
{

function add()

{   

$x=800;

$y=200;

$sum=$x+$y;

echo "sum of given no=".$sum."<br/>";	

}

function sub()

{

$x=1000;

$y=200;

$sub=$x-$y;

echo "Sub of given no=".$sub;	

}

}

?>

Object

Object is the instance of the class.
Once a class has been defined, objects can be created from the class through "new" keyword.
class methods and properties can directly be accessed through this object instance.
Connector(Dot operator->) symbol used to connect objects to their properties or methods.

Note: You can not access any property of the class without their object> Syntax

  $obj= new demo();

<?php

class demo

{

function add()

{   

$x=800;

$y=200;

$sum=$x+$y;

echo "sum of given no=".$sum."<br/>";

}

function sub()

{

$x=1000;

$y=500;

$sub=$x-$y;

echo "Sub of given no=".$sub;	

}

}

$obj= new demo();

$obj->add();

$obj->sub();

?>

Output Sum=1000 Subtraction=500

Ex ii

<?php

class demo

{

var   $msg="welcome";

function test()

{   

echo  "Users";    	

 }
	
}

$obj= new demo();

echo  $obj->msg;

$obj->test();
 
?>

Output welcome users

Using Parametrized method

<?php
	
class demo
{
function add($a,$b)
{   

$sum=$a+$b;

echo "Sum=".$sum."<br/>";	

}

function sub($x,$y)

{

$sub=$x-$y;

echo "Subtraction=".$sub;	

}

}

$obj= new demo();

$obj->add(800,200);

$obj->sub(1000,500);
  
?>

Output Sum=1000 Subtraction=500

Create dynamic program using oops(Numbers entered by user)

<?php

class demo

{

function add($a,$b)

{   

$sum=$a+$b;

echo "Sum=".$sum."<br/>";	

}

function sub($x,$y)

{

$sub=$x-$y;

echo "Subtraction=".$sub;	

}

}

$obj= new demo();

$obj->add($_GET['f'],$_GET['s']);

$obj->sub($_GET['f'],$_GET['s']);

?>
  
<form>

Enter first number<input type="text" name="f"/><hr/>

Enter second number<input type="text" name="s"/><hr/>

<input type="submit" value="Show result"/>

</form>

Output Sum=1500 Subtraction=500 Enter first number Enter second number

PHP Object Oriented PHP Class Object PHP $this class PHP Constructor and Destructor PHP Encapsulation PHP Inheritance PHP Polymorphism PHP Access Modifier PHP Final Class PHP Abstract and Interface Class PHP Data Insert using OOP Fetch data from MySQL using OOP Encrypt and Decrypt String in PHP PHP Function PHP Local Variables PHP Global Variables PHP Static Variables PHP Parametrized Function Find sum of n numbers using function PHP Recursive Function Php Parameterized Functions Php Check Number in Function

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