php修改config表里面的配置信息

                       unset($_POST['button']);
	    	       $m = M('config');
		 	foreach($_POST as $name=>$val){
		 		$data['name'] = $name;
		 		$data['value'] = $val;

		 		$result = $m->where(array('name'=>$name))->find();
				if($result){
					$m->where(array('name'=>$name))->save($data);

				}else{
					$m->add($data);
				}