thinkphp3.2.3保持分页搜索条件

$level_name = I("level_name");if(!empty($level_name)){    $w['level_name']=array("like","%".trim(I('level_name'))."%");}$this->assign("level_name",I("level_name"));$w['status'] = '1';$level = M('store_employee_level'); // 实例化User对象$count      = $level->where($w)->count();// 查询满足要求的总记录数$Page       = new \Think\Page($count,10);// 实例化分页类 传入总记录数和每页显示的记录数(25)if(!empty($level_name)){    $w['level_name']=trim(I('level_name'));}foreach($w as $key=>$val) {    $Page->parameter[$key]   =   $val;}$w['level_name']=array("like","%".trim(I('level_name'))."%");