thinkphp怎么查出哪里的错误

namespace Manzige\Controller;
    public function refreshbatch(){
        $ids = I('ids');
        !preg_match('#^[\d,]+$#', $ids) && $this->error('参数错误！');
        $site_model = M('Site');
        $site_refresh_model = D('SiteRefresh');
        if($ids){
            $ids = explode(',', $ids);
            if(count($ids) > 0){
                $success = 0;
                foreach ($ids as $k=>$v){
                    $map = array(
                        'id'        =>    $v,
                    );
                    $site = $site_model->where($map)->find();
                    $site_id = $site['id'];
                    if($site_id && !$site_refresh_model->where(array('site_id'=>$site_id,'state'=>0))->count()){
                        $site_refresh_model->build($site_id, $site['site_domain']) && $success++;
                    }
                }
                if($success > 0){
        

说明没有进入if，去检查3,4,5,6行的代码。不过，你**$this->error('参数错误！')**返回什么？