Yii2重置密码

//Yii框架下hash密码正确的比较方法
$result = Yii::$app->security->validatePassword($password, $hash);
echo $result;//生成密码
public function generatePasswordHash($password, $cost = null)
    {
        if ($cost === null) {
            $cost = $this->passwordHashCost;
        }        if (function_exists('password_hash')) {
            /** @noinspection PhpUndefinedConstantInspection */
            return password_hash($password, PASSWORD_DEFAULT, ['cost' => $cost]);
        }        $salt = $this->generateSalt($cost);
        $hash = crypt($password, $salt);
        // strlen() is safe since crypt() returns only ascii
        if (!is_string($hash) || strlen($hash) !== 60) {
            throw new Exception('Unknown error occurred while generating hash.');
        }        return $hash;
    }

//生成盐
protected function generateSalt($cost = 13)
    {
        $cost = (int) $cost;
        if ($cost < 4 || $cost > 31) {
            throw new InvalidParamException('Cost must be between 4 and 31.');
        }        // Get a 20-byte random string
        $rand = $this->generateRandomKey(20);
        // Form the prefix that specifies Blowfish (bcrypt) algorithm and cost parameter.
        $salt = sprintf("$2y$%02d$", $cost);
        // Append the random salt data in the required base64 format.
        $salt .= str_replace('+', '.', substr(base64_encode($rand), 0, 22));        return $salt;
    }

//验证密码
public function validatePassword($password, $hash)
    {
        if (!is_string($password) || $password === '') {
            throw new InvalidParamException('Password must be a string and cannot be empty.');
        }        if (!preg_match('/^\$2[axy]\$(\d\d)\$[\.\/0-9A-Za-z]{22}/', $hash, $matches)
            || $matches[1] < 4
            || $matches[1] > 30
        ) {
            throw new InvalidParamException('Hash is invalid.');
        }        if (function_exists('password_verify')) {
            return password_verify($password, $hash);
        }        $test = crypt($password, $hash);
        $n = strlen($test);
        if ($n !== 60) {
            return false;
        }        return $this->compareString($test, $hash);
    }