zxcms/frontend/models/SignupForm.php

<?php
namespace frontend\models;

use yii\base\Exception;
use yii\base\Model;
use core\entities\user\User;
use Yii;

/**
 * Signup form
 */
class SignupForm extends Model
{
    public string $username;
    public string $email;
    public string $password;

	/**
     * @inheritdoc
     */
    public function rules(): array
    {
        return [
            ['username', 'trim'],
            ['username', 'required'],
            ['username', 'unique', 'targetClass' => User::class, 'message' => Yii::t('auth', 'This username has already been taken.')],
            ['username', 'string', 'min' => 2, 'max' => 255],

            ['email', 'trim'],
            ['email', 'required'],
            ['email', 'email'],
            ['email', 'string', 'max' => 255],
            ['email', 'unique', 'targetClass' => User::class, 'message' => Yii::t('auth', 'This email address has already been taken.')],

            ['password', 'required'],
            ['password', 'string', 'min' => 6],
        ];
    }

    /**
     * @return User|null
     * @throws Exception
     */
    public function signup(): ?User
    {
        if (!$this->validate()) {
            return null;
        }
        
        $user = new User();
        $user->username = $this->username;
        $user->email = $this->email;
        $user->setPassword($this->password);
        $user->generateAuthKey();
        
        return $user->save() ? $user : null;
    }
}