In this tutorial we will study about abstract class in PHP, how to declare, use an abstract class etc. Examples will help you to understand the concepts of abstract class more precisely.
In this tutorial we will study about abstract class in PHP, how to declare, use an abstract class etc. Examples will help you to understand the concepts of abstract class more precisely.PHP Abstract Class:
Abstract classes and methods are introduced in PHP 5. The concept behind the abstract class is that we need to extend this class by its descendant class(es). If a class contains abstract method then the class must be declared as abstract. Any method which is declared as abstract must not have the implementation part but the declaration part only.
The child classes which inherits the property of abstract base class, must define all the methods declared as abstract.
PHP Abstract Class Example:
<?php
abstract class
One{}
}
class
Two extends One{ public function disp(){}
}
class
Three extends One{//no method is declared
}
$two
=new Two();echo
"<b>Calling from the child class Two:</b><br/>";$two
->disp();echo
"<b>Calling from the child class Three:</b><br/>";$three
=new Three();$three
->disp();?>
Output:
Calling from the child class Two:
Inside the child class
Calling from the child class Three:
Inside the parent class
Example:
<?php
abstract class
One{ abstract function disp();}
class
Two extends One{ public function disp(){ echo "Inside the child class<br/>";}
}
class
Three extends One{}
$two
=new Two();echo
"<b>Calling from the child class Two:</b><br/>";$two
->disp();echo
"<b>Calling from the child class Three:</b><br/>";$three
=new Three();$three
->disp();?>
Output:
Calling from the child class Two: