"PHP Classes and objects" Final keyword

This article introduces the content of "PHP class and object" Final keyword, has a certain reference value, now share to everyone, the need for friends can refer to

Final keyword

To be declared Final:

1. Class, cannot be inherited. 2. Methods, can not cover the quilt class. 3. Attributes, constants, cannot be defined as Final

Example #1 Final Method Example <?phpclass baseclass {public   function test () {       echo "baseclass::test () called\n";   }   Final public Function moretesting () {       echo "baseclass::moretesting () called\n";   }} Class ChildClass extends BaseClass {public   function moretesting () {       echo "childclass::moretesting () called\n";   }} Results in Fatal error:cannot override final Method baseclass::moretesting ()?>

example #2 Final Class Example <?phpfinal class BaseClass {public function test () {   echo "Baseclass::test () called\n";   }//Whether or not you declare the method as final, there is no relation to the final public function moretesting () {echo "baseclass::moretesting () called\n"; }}class ChildClass extends BaseClass {}//generate Fatal Error:class ChildClass may not inherit from final Class (BaseClass)? & gt;