Decorator Pattern

<?php abstract class Goggle{ abstract function get_impairement_of_judgement(); } class BeerGoggle extends Goggle{ private $_impairement_of_judgement = 0; public function get_impairement_of_judgement(){ return $this->_impairement_of_judgement; } } abstract class GoggleDecorator extends Goggle{ protected $_goggle; public function __construct(Goggle $goggle){ $this->_goggle = $goggle; } } class SixPack extends GoggleDecorator{ public function get_impairement_of_judgement(){ return $this->_goggle->get_impairement_of_judgement() + 6; } } class TwelvePack extends GoggleDecorator{ public function get_impairement_of_judgement(){ return $this->_goggle->get_impairement_of_judgement() + 12; } } class RedBull extends GoggleDecorator{ public function get_impairement_of_judgement(){ return $this->_goggle->get_impairement_of_judgement() -0.5; } } echo '~~~~~~~~~~~~~ Decorator Example: ~~~~~~~~~~~~~'; $goggle = new BeerGoggle(); echo 'Goggles Only Impairment: ' . $goggle->get_impairement_of_judgement() . '%<br>'; $six_beers = new SixPack(new BeerGoggle()); echo '6 Pack Impairment: ' . $six_beers->get_impairement_of_judgement() . '%<br>'; $twelve_beers = new TwelvePack(new BeerGoggle()); echo '12 Pack Impairment: ' . $twelve_beers->get_impairement_of_judgement() . '%<br>'; $eighteen_beer_goggle = new TwelvePack(new SixPack(new BeerGoggle())); echo '18 Pack Impairment: ' . $eighteen_beer_goggle->get_impairement_of_judgement() . '%<br>'; $six_beers_and_a_redbull = new RedBull(new SixPack(new BeerGoggle())); echo 'Six Pack and a Redbull: ' . $six_beers_and_a_redbull->get_impairement_of_judgement() . '%<br><br>'; ?>