安装：composer require alibabacloud/dysmsapi-20170525 2.0.24

官方文档：短信服务_SDK中心-阿里云OpenAPI开发者门户 (aliyun.com)

特别注意：传入参数获得值形式

正确：

        $PhoneNumbers = $postData['PhoneNumbers'];
        $signName = $postData['signName'];
        try {

            $sendSmsRequest = new SendSmsRequest([
                "phoneNumbers" => $PhoneNumbers,
                "signName" => $signName,
                "templateCode" => 'SMS_xxx',
                "templateParam" => json_encode(array('code' => $code))
            ]);
            $runtime = new RuntimeOptions([]);

错误：

        try {
            $sendSmsRequest = new SendSmsRequest([
                "phoneNumbers" => $postData['phoneNumbers'],
                "signName" => $postData['signName'],
                "templateCode" => 'SMS_xxxx',
                "templateParam" => json_encode(array('code' => $code))
            ]);
            $runtime = new RuntimeOptions([]);

这样也不行

$sendSmsRequest = new SendSmsRequest($addData);

参考：php利用阿里云短信SDK实现短信发送功能_php 阿里云短信-CSDN博客