Php Oop

OOP OBJECT ORIENTED PROGRAMMING

BASIC OOP ,[object Object],Contains variable and functions working with these variable. A class has its own properties. An object is an instance of a class ,[object Object],Consist of data structures and functions for manipulating the data. Data structure refers to the type of data while function refers to the operation applied to the data structure. An object is a self contained run time entity. ,[object Object],[object Object],Process of selecting the commons features from different function and objects. The functions those perform same actions can be joined into a single function using abstraction. Process of joining data and objects into another object. It hides the details of data. ,[object Object],Process of using a single function or an operator in different ways. The behavior of that function will depend on the type of the data used in it. ,[object Object],[object Object],Process of creating a new class from the existing class. The new class is called derived class while the existing class from which the new class is derived is called the base class.

CREATING A CLASS class class_name { var class_variable; function function_name()‏ } ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],The syntax for declaring a class:-

EXAMPLE <?php // PHP 5 // class definition class Bear { // define properties public $name; public $weight; public $age; public $sex; public $colour; // define methods public function eat() { echo $this->name." is eating... "; } public function run() { echo $this->name." is running... "; } public function kill() { echo $this->name." is killing prey... "; } public function sleep() { echo $this->name." is sleeping... "; } } ?> </body> </html>

[object Object],CREATING A CLASS - INHERITED CLASS The syntax for inheriting a new class is: class new_class extends class_name { var class_variable; function function_name()‏ } ,[object Object],[object Object],[object Object]

EXTENDS ,[object Object],<?php // PHP 5 // class definition class Bear { // define properties public $name; public $weight; public $age; public $sex; public $colour; // define methods public function eat() { echo $this->name." is eating... "; } public function run() { echo $this->name." is running... "; } public function kill() { echo $this->name." is killing prey... "; } public function sleep() { echo $this->name." is sleeping... "; } } ?> </body> </html> // extended class definition class PolarBear extends Bear { // constructor public function __construct() { parent::__construct(); $this->colour = "white"; $this->weight = 600; } // define methods public function swim() { echo $this->name." is swimming... "; } } ?>

CONSTRUCTOR ,[object Object],[object Object],[object Object]

CONSTRUCTOR OUTPUT:- Baby Bear is brown and weighs 100 units at birth <?php // PHP 5 // class definition class Bear { // define properties public $name; public $weight; public $age; public $colour; // constructor public function __construct() { $this->age = 0; $this->weight = 100; $this->colour = "brown"; } // define methods } ?> </body> </html> <?php // create instance $baby = new Bear; $baby->name = "Baby Bear"; echo $baby->name." is ".$baby->colour." and weighs ".$baby->weight." units at birth"; ?> </body> </html>

PRIVATE ,[object Object],makes it possible to mark class properties and methods as private, which means that they cannot be manipulated or viewed outside the class definition. This is useful to protect the inner workings of your class from manipulation by object instances. Consider the following example, which illustrates this by adding a new private variable, $_lastUnitsConsumed, to the Bear() class:

PUBLIC,PROTECTED <?php // PHP 5 // class definition class Bear { // define public properties public $name; public $age; // more properties // define public methods public function eat() { echo $this->name." is eating... "; // more code } // more methods } ?> By default, class methods and properties are public; this allows the calling script to reach inside your object instances and manipulate them directly.

KEYWORD - new ,[object Object],mean "create a new object of class Bear() and assign it to the variable $daddy ". <?php $daddy->name = "Daddy Bear"; ?> mean "assign the value Daddy Bear to the variable $name of this specific instance of the class Bear()", <?php $daddy->sleep(); ?> would mean "execute the function sleep() for this specific instance of the class Bear()". Note the -> symbol used to connect objects to their properties or methods, and the fact that the $ symbol is omitted when accessing properties of a class instance

KEYWORD - $this ,[object Object],[object Object],<?php // PHP 5 // class definition class Bear { // define properties public $name; public $weight; // define methods public function eat($units) { echo $this- >name." is eating ".$units." units of food... "; $this->weight += $units; } } ?>

KEYWORD - final ,[object Object],[object Object]

Exception handling ,[object Object],<?php try { $error = 'Always throw this error'; throw new Exception($error); // Code following an exception is not executed. echo 'Never executed'; } catch (Exception $e) { echo 'Caught exception: ', $e->getMessage(), ""; } // Continue execution echo 'Hello World'; ?>

Php Oop

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Php Oop