责任链模式

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<?php class board{     protected $power = 1;     protected $top = "admin";     public function process($lev){         if($lev <= $this->power){             echo "版主删帖";         }else{             $top = new $this->top;             $top->process($lev);         }     } } class admin{     protected $power = 2;     protected $top = "police";     public function process($lev){         if($lev <= $this->power){             echo "管理员封账号";         }else{             $top = new $this->top;             $top->process($lev);         }     } } class police{     protected $power;     protected $top = null;     public function process($lev){         echo "抓起来";     } } //责任链模式来处理举报问题 $lev = $_POST['jubao']+0; $judge = new board(); $judge->process($lev);