责任链模式

class Board{    public $lev = 1;    public $top = 'Admin';//他的上级    public function process($lev){        if($this->lev >= $lev){            echo '粗口';        } else {            $a = new $this->top();            $a->process($lev);        }    }}class Admin{    public $lev = 2;    public $top = 'Police';    public function process($lev){        if($this->lev >= $lev){            echo '动手';        } else {            $a = new $this->top();            $a->process($lev);        }    }}class Police{    public $lev ;    public $top;    public function process($lev){            echo '犯法';    }}$info = $_POST["ju"];//1/2/3$b = new Board();$b->process($info);