haoshengxin/frontend/models/SignupForm.php

<?php
namespace frontend\models;

use yii\base\Model;
use common\models\User;

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


    /**
     * @inheritdoc
     */

    public static function tableName()
    {
        return '{{%user}}';
    }

    public function rules()
    {
        return [
            [['username', 'auth_key', 'password_hash', 'status', 'created_at', 'updated_at'], 'required'],
            [['role'], 'string'],
            [[ 'status', 'created_at', 'updated_at','state'], 'integer'],
            [['username', 'auth_key', 'email'], 'string', 'max' => 32],
            [['password_hash', 'password_reset_token', 'access_token'], 'string', 'max' => 255],
            [['username'], 'unique'],
//            [['email'], 'unique'],
            [['password_reset_token'], 'unique'],
        ];
    }

    /**
     * Signs user up.
     *
     * @return User|null the saved model or null if saving fails
     */
    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();
        
        return $user->save() ? $user : null;
    }
}