@小程府 那个save()方法就可以判断是更新还是添加:

    public function save($runValidation = true, $attributeNames = null)
    {
        if ($this->getIsNewRecord()) {
            return $this->insert($runValidation, $attributeNames);
        } else {
            return $this->update($runValidation, $attributeNames) !== false;
        }
    }

这是源码里的save方法,你可以去看一下文档

那把and去掉吧,毕竟我也没有测试,不知道行不行哈

可以这样:

var $username='张三';
var $email ='qq@qq.com';
var $mobile =18888888888;

$result=User::find()->where([
'status'=>1,
])->andwhere([
'or',
['like','username',$username],
['like','email',$email],
['like','mobile',$mobile],
])->all();

你看看这样行不行:

$goods= new Goods();
$attr=['name'=>'西门子','price'=>12,'brand'=>'TOTO'];
$goods->setAttributes($attr);
$goods->save();

在表USER的模型中创建:
/**

 * relation: get Task.
 * @return Task
 */
public function getTask ()
{
    return $this->hasMany(Task::className(), ['task.u_id' => 'id']);
}

然后:
$data=USER::find()->with([
'task'=>function(\yii\db\ActiveQuery $query){
$query->counn('u_id');
},
])->all();
你试一下,我没有测试

可以这样:
先在表ht_user_comm 的模型中增加:

public function getHtDiary()
{
    return $this->hasMany(HtDiary::className(), ['id' => 'cid']);  // hasMany可能为hasOne
}

,然后:
$data = UserComm::find()->with([
'htDiary'=>function(\yii\db\ActiveQuery $query) use $id{

$query->where[

'htDiary.id' => $id'
]},
])->orderBy([
'user_comm.count_praise' => SORT_DESC
])->asArray()->all();
我没有测试,你试一下

上传时,先用js判断一下图片类型,再在模型中判断类型.模型中增加验证规则:
public function rules()

{
    $conf = Yii::$app->params['ware.comment']['image'];
    return array_merge(parent::rules(), [
        [
            'pic', 'image',
            'extensions' => 'jpg, png',
            'mimeTypes' => 'image/jpeg, image/png',
            'minSize' => 1000 * $conf['weight.limit'][0],
            'maxSize' => 1000 * $conf['weight.limit'][1],
            'tooSmall' => '{attribute}不能小于' . $conf['weight.limit'][0] . 'KB',
            'tooBig' => '{attribute}不能大于' . $conf['weight.limit'][1] . 'KB',
            'minWidth' => $conf['size.limit']['min'][0],
            'minHeight' => $conf['size.limit']['min'][1],
        ],
    ]);
}

这样写,你看行不行?

UserComment::deleteAll([
'and',
['in','id', $id_list]
]);

$id_list里面是数组