Two different ways to implement Decorator pattern in PHP -

while doing tutorials on decorator pattern, i've encountered 2 different implementations.

implementation 1 (referred i1)

implementation 2 (referred i2)

in short,

i1's parent decorator class implements original object's interface (in example, class propertydecorator implements propertyinterface. original object property implements propertyinterface well).

i2's parent decorator class not implement original object's interface (in example, decorator_wrapper not implements cupcake interface. in fact, there not cupcakeinterface @ all).

my question is,

is merely personal preference of understanding , implementing decorator pattern? or 1 wrong , 1 right?

just depends on needs. let's see:

abstract class

• can provide abstract methods.
• can provide real functions , variables.
• can extended. class can extend 1 parent.

interface

• can provide abstract methods.
• a class may implement several interfaces.

i prefer using base abstract class, because can declare basic functions well, since have lot of different types of decorators similar functionality. methods can overriden anyways + can implement interfaces.

class decorator extends decorator_wrapper implements interface1, inteface2 {   public function __construct(){     parent::__construct() ; // here perform basic decorator actions. advantage compared interfaces.   } }