登录总是错误的凭证 - Yii2

Question

我已根据我的用户表自定义了注册表单，在自定义后我尝试注册我使用＆＃39; 123456＆＃39;填写了密码表单。作为密码。完成注册后，它说我输入了错误的密码？

这里是SignupForm模型的方法：

public function signup()
{
    if (!$this->validate()) {
        return null;
    }

    $user = new User();
    $user->username = $this->username;
    $user->email = $this->email;
    $user->setPassword($this->password);
    $user->generateAuthKey();

    $user->first_name = $this->first_name;
    $user->middle_name = $this->middle_name;
    $user->last_name = $this->last_name;
    $user->contact = $this->contact;
    $user->birth_date = $this->birth_date;
    $user->type = $this->type;
    $user->external_type = $this->external_type;
    $user->status = $this->status;
    $user->region_id = $this->region_id;
    $user->barangay_id = $this->barangay_id;
    $user->province_id = $this->province_id;
    $user->city_municipal_id = $this->city_municipal_id;

    return $user->save() ? $user : null;

}

用户模型

public function setPassword($password)
{
    $this->password_hash = Yii::$app->security->generatePasswordHash($password);
}

我遵循了Yii2高级应用程序的正确安装程序，我已经完成了迁移。它出了什么问题？