CREATING CLASS IN PHP PROGRAM

As we know Object-oriented programming (OOP) is a programming model based on the concept of objects.

Before starting OOP tutorial, it is necessary to know some key words used in php object oriented programming.

• Class : This is a programmer defined datatype.A class can have sub classes that can inherit all or some of the characteristics of the class. 
• Object : An individual instance of the data structure defined by a class. 
• Member Variable : These are the variables defined inside a class.
• Member function : These are the function defined inside a class and are used to access object data.
• Inheritance : When a class is defined by inheriting existing function of a parent class then it is called inheritance.
• Parent class : A class that is inherited from by another class. This is also called a base class or super class.
• Child Class : A class that inherits from another class. This is also called a subclass or derived class.
• Polymorphism : This is an object oriented concept where same function can be used for different purposes.
• Overloading : Functions and operators overloaded with different implementation.
• Data Abstraction: Hiding of background details
• Encapsulation: Wrapping of data and functions together in a single unit
• Constructor : Used to construct an object
• Destructors : Used to destruct an object

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Basic PHP class syntax:

<?php class person { ..................... ..................... } ?>

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PHP class Example:

<?php class person { var $name; function set_name($new_name) { $this->name = "hello"; } function get_name() { return $this->name; } } ?>

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