What Is Abstraction In Php?

1.	What Is Abstraction In Php?
Answer» ABSTRACTION are defined using the keyword abstract . PHP 5 introduces abstract classes and methods. Classes defined as abstract may not be INSTANTIATED (create object). To extend the Abstract class, extends operator is used. You can inherit only one abstract class at one time extending. Any class that contains one abstract method must also be declare as abstract. Methods defined as abstract simply declare the method's SIGNATURE, they can't define the implementation. 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.

Answer»

ABSTRACTION are defined using the keyword abstract .
PHP 5 introduces abstract classes and methods. Classes defined as abstract may not be INSTANTIATED (create object).
To extend the Abstract class, extends operator is used.
You can inherit only one abstract class at one time extending.
Any class that contains one abstract method must also be declare as abstract. Methods defined as abstract simply declare the method's SIGNATURE, they can't define the implementation.
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.

Discussion