PHP : Final Keyword

Final Keyword

Final Keyword :

Php5 introduces the final keyword , to specify a constant member function or a constant class. If a member function is declared as “final” that cannot be overridden in the sub-class.

 If a class is declared as final that cannot be inherited , we cannot create a sub-class for a final class that means after extends keyword we cannot give a final class.

Constant Function:

Final function display()

{

}

Constant Class:

Final class A

{

}

ReferenceTest.php

<?php

class A{

    public $x=11;

   

}

?>

<?php

$o1 =new A();

$o2= $o1;

echo $o1->x."--".$o2->x."<br>";

$o2->x=22;

echo $o1->x."--".$o2->x;

?>

OutPut:

11--11

22--22 

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