Oops Concepts in PHP For Beginners

Classes Structure

A Class is a blueprint of an object information. It defines the variables and methods that gives a collection of information. For example, lets just see some examples to know the structure of the class :

<?PHP

class animal 
{
	//define the class propertise go here	
}

?>

<?PHP

class animal

{

//define the class propertise go here

}

Create object of class

An Object is a actual thing that create bases of a blueprint (class).

Properties of an object :

Identity: the property of an object that distinguishes it from other objects
State: describes the data stored in the object
Behavior: describes the methods in the object’s interface by which the object can be used

<?PHP

$obj = new animal();

?>

<?PHP

$obj = new animal();

Bellow is the complete code that define a class and and an object.

<?PHP

class animal 
{
	function display()
	{
		echo "Hello world!";	
	}
}
#create a object
$obj = new animal();

$obj->display();

?>

<?PHP

class animal

{

function display()

{

echo "Hello world!";

}

#create a object

$obj = new animal();

$obj->display();

Copy and paste that code and save as test.php and reloading your browser now you get the outputs the following:

Hello world!

Using of Constructors and Destructors

PHP provides the magic method__construct() which called when you create an object of a class.

<?php  
  
class animal
{  
    public $x = "I'm a class property!";  
  
    public function __construct()  
    {  
        echo 'The class "', __CLASS__, '" was initiated!&lt;br /&gt;';  
    }  
  
    public function setProperty($newval)  
    {  
        $this->x = $newval;  
    }  
  
    public function getProperty()  
    {  
        return $this->x . "<br />";  
    }  
}  
  
// Create a new object  
$obj = new animal;  
  
// Get the value of $prop1  
echo $obj->gt;getProperty();  
  
// Output a message at the end of the file  
echo "Output is here.&lt;br /&gt;";  
  
?>

<?php

class animal

{

public $x = "I'm a class property!";

public function __construct()

{

echo 'The class "', __CLASS__, '" was initiated!<br />';

}

public function setProperty($newval)

{

$this->x = $newval;

}

public function getProperty()

{

return $this->x . "<br />";

}

// Create a new object

$obj = new animal;

// Get the value of $prop1

echo $obj->gt;getProperty();

// Output a message at the end of the file

echo "Output is here.<br />";

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Oops Concepts in PHP For Beginners

Classes Structure

Create object of class

Using of Constructors and Destructors

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