Use Alibaba Dayu SMS to send verification code

public function index()
{
    $client  = new Client;
    $request = new SmsNumSend;
 
    // 短信内容参数
    $smsParams = [
        'code'    => $this->randString(),
        'product' => '测试的'
    ];
 
    // 设置请求参数,具体参数可以参考官方文档
    $req = $request->setSmsTemplateCode('SMS_6620027')
        ->setRecNum('18600000000')
        ->setSmsParam(json_encode($smsParams))
        ->setSmsFreeSignName('注册验证')
        ->setSmsType('normal')
        ->setExtend('123456');
 
    print_r($client->execute($req));
}
 
/**
 * 获取随机位数数字
 * @param  integer $len 长度
 * @return string      
 */
protected static function randString($len = 6)
{
    $chars = str_repeat('0123456789', $len);
    $chars = str_shuffle($chars);
    $str   = substr($chars, 0, $len);
    return $str;
}