yii2 查询数据库语法

 1         $query0 = ImGroupUser::find()->where([‘gid‘=>‘56680dfc60b215d62104a4d8‘])->select(‘user_client_id‘)->all();//AR
 2         $query1=ImGroupUser::findAll([‘gid‘=>‘56680dfc60b215d62104a4d8‘]);//AR
 3         $query2=ImGroupUser::findBySql("select user_client_id from im_group_user where gid=‘56680dfc60b215d62104a4d8‘")->all();//AR
 4         $query3=ImGroupUser::find()->where([‘gid‘=>‘56680dfc60b215d62104a4d8‘])->select(‘user_client_id‘)->asArray()->all();//Array
 5         $query = new yii\db\Query();
 6         $query4 = $query
 7             ->select([‘user_client_id‘])
 8             ->from([‘im_group_user‘])
 9             ->where([‘gid‘=>‘56680dfc60b215d62104a4d8‘])
10             ->all();//Array
11         $arr=[];
12         foreach($query4 as $key=>$value){
13 //            $arr[]=$value->user_client_id;
14             $arr[]=$value[‘user_client_id‘];
15         }
16         var_dump($arr);