https://github.com/econea/nusoap

* composer install

composer require econea/nusoap:~0.9.5.1

* .\app\Http\Controllers\SoapController.php

<?php
/**
 * Created by PhpStorm.
 * User: mingzhanghui
 * Date: 9/11/2018
 * Time: 6:17 PM
 */
namespace App\Http\Controllers;

use Illuminate\Http\Request;

class SoapController extends Controller {

    /**
     * http://localhost:8000/soap/sms?phoneNo=1300????562&content=easyeyes%20test%20of%20econea/nusoap
     * @param Request $request
     * @return int
     * -7621671117161187846
     */
    public function sms(Request $request) {
        $phoneNo = $request->get('phoneNo');
        $content = $request->get('content');

        $parameter = array(
            'userId' => '??????',
            'password' => '??????',
            'pszMobis' => $phoneNo,
            'pszMsg' => $content,
            'iMobiCount' => 1,
            'pszSubPort' => '*',
            'MsgId' => '???'
        );
        $smsService = new \nusoap_client('http://211.100.34.185:8016/MWGate/wmgw.asmx', false);
        $smsService->soap_defencoding = 'utf-8';
        $smsService->decode_utf8 = false;
        $smsService->xml_encoding = 'utf-8';
        $ret = $smsService->call('MongateSendSubmit', $parameter);
        return $ret;
    }

}
// ./routes/web.php
$router->get('soap/sms', 'SoapController@sms');