PHP 設計模式之觀察者模式實現

<?phpInterface Obseverr{   public function update(Obseverable $subject);}abstract class Obsever implements Obseverr{   protected $date;   public function update(Obseverable $date){      $this->date = $date;   }}abstract class Obseverable{    private $Obsevers = array();    public function addObsever(Obsever $obj){        array_push($this->Obsevers,$obj);    }    public function notifyObsevers(){        foreach( $this->Obsevers as $v){           $v->update($this);        }    }}class test1 extends Obsever{    public function fire(){       foreach($this->date->getRecord() as $k => $v){          $ret .= $v;       }       echo '類別1輸出'.$ret.'<br>';    }}class test2 extends Obsever{    public function fire(){       foreach($this->date->getRecord() as $k => $v){          $ret .= $v;       }       echo '類別2輸出'.$ret.'<br>';    }}class dateResource extends Obseverable{     private $record = array();     public function addRecord($recArr){
  array_push($this->record,$recArr);   
        $this->notifyObsevers();     }     public function getRecord(){        return $this->record;     }}$DateIns = new dateResource();$DateIns->addObsever($test1Ins = new test1());$DateIns->addObsever($test2Ins = new test2());$DateIns->addRecord('xiaojiang1');$test1Ins->fire();$DateIns->addRecord('xiaojiang2');$test1Ins->fire();$test2Ins->fire();?>

 用法和用例 http://blog.csdn.net/alpeace/article/details/7588042