Final Keyword


Final Method


  • If you declare method as final in super class it can't be overridden in any of its subclass.

Example :
<?php
class Super

{
 public final function display()
 {
 echo "Inside the final function";
 }
}
class Sub extends Super
{
function display()
{
echo "Final function";
}
}
$obj=new Sub();
s$obj->display();
?>

Output :
Fatal error: Cannot override final method Super::display()

Class as Final


  • If you can declare a class as final, which will intercept anyone from extending it.

Example :
<?php
final class Super
{
  public function display()
  {
   echo "Inside the final function";
  }
}
class Sub extends Super
{
 function display()
  {
    echo "Inside the final function";
   }
}
$obj=new Sub();
$obj->display();
?>

Output :
Fatal error: Class Sub may not inherit from final class (Super)