Render content directly from Yii controller in PHP

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if(!$serverId){
    echo "<script>alert('请选择区服');setTimeout(function(){history.go(-1);},1000)</script>";die;
}
if(!$type){
    echo "<script>alert('请填写活动类型');setTimeout(function(){history.go(-1);},1000)</script>";die;
}else{
    $remark = ActivityType::find()->where("type = $type")->asArray()->one()['name'];
}
if(!$beginTime){
    echo "<script>alert('请选择开始时间');setTimeout(function(){history.go(-1);},1000)</script>";die;
}
if(!$endTime){
    echo "<script>alert('请选择截止时间');setTimeout(function(){history.go(-1);},1000)</script>";die;
}