Abstract Class in Php

Abstract class in PHP:

•     Abstract Class  contains only declare the method's signature, they can't define the implementation.

•     Abstraction class are defined using the keyword abstract .
•     Abstract Class is not possible to implement multiple inheritance.
•     Latest version of PHP 5 has introduces abstract classes and methods.
•     Classes defined as abstract , we are unable to create the object ( may not instantiated ).

•     we can extend the Abstract class, by using extends operator.
•     we can inherit only one abstract class at one time extending.
•     Any class that contains one abstract method must also be declare as abstract.
•     All methods marked as abstract in the parent's class, declaration must be defined by the   child.
•     Additionally, these methods must be defined with the same (or a less restricted) visibility           (Public,Protected & private).
•     Type hint & number of parameter must be match between parent & child class.

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