How to send text messages using SMS Bao in php

<?phpnamespace Home\Controller;use Think\Controller;use Org\Sms\SmsBao;class IndexController extends Controller {    public function index(){
        $sms = new SmsBao("账号", "密码");
        $msg = $sms->sendSms("1537539****", "这是一个测试短信！");        if($msg[&#39;status&#39;] == 0) {            echo &#39;发送成功！&#39;;
        } else {            echo &#39;发送失败！&#39;;
        }        echo $sms->getBalance(); // 返回剩余条数   }
}

<?php// +----------------------------------------------------------------------// | smsbao for thinkPHP// +----------------------------------------------------------------------// | Copyright (c) 2005 http://smsbao.com All rights reserved.// +----------------------------------------------------------------------// | Licensed ( http://smsbao.com )// +----------------------------------------------------------------------namespace Org\Sms;/** * SmsBao实现类 * @category   Think * @package  Think * @subpackage  Sms */class SmsBao {    private $account;//短信包账户    private $password;//密码    private $balance;//短信剩余条数    const sendSmsUrl = "http://api.smsbao.com/sms";    const queryBalanceUrl = "http://api.smsbao.com/query";    /**     * 架构函数     * @access public     * @param string $account  在短信宝注册的账户名     * @param string $password  在短信宝注册的账户名的密码     */    public function __construct($account,$password) {        if (empty($account) || empty($password)) {           E("用户名和密码不可为空!");
        }
        $this->account = $account;
        $this->password = $password;
    }    
    /**     * 发送短信函数     * @access public     * @param string $mobile  手机号，多个手机号用英文逗号分隔     * @param string $content  发送内容     * @return array 返回值为数组，其中status为0表明发送成功，其他情况下发送失败，失败原因为msg     */    public function sendSms($mobile,$content){
        $param[&#39;u&#39;] = $this->account;
        $param[&#39;p&#39;] = md5($this->password);
        $param[&#39;m&#39;] = $mobile;
        $param[&#39;c&#39;] = $content;
        $ret = self::http(self::sendSmsUrl, $param);
        $data[&#39;status&#39;] = $ret;
        $data[&#39;msg&#39;] = $ret == 0 ?&#39;发送成功&#39; : self::getResult($ret);        return $data;
    }    
    /**     * 获取短信剩余条数函数     * @access public     */    public function getBalance(){
        $param[&#39;u&#39;] = $this->account;
        $param[&#39;p&#39;] = md5($this->password);
        $ret = self::http(self::queryBalanceUrl, $param);
        $retArr = split("\n", $ret);
        $balanceArr = split(",", $retArr[1]);
        $this->balance = $retArr[0] == 0 ? $balanceArr[1] : self::getResult($ret);        return $this->balance;
    }   /**     * 发送http请求     * @access protected     * @param string $url  请求地址     * @param string $param  get方式请求内容，数组形式，post方式时无效     * * @param string $data  post请求方式时的内容，get方式时无效     * @param string $method  请求方式，默认get     */    protected static function http($url, $param, $data = &#39;&#39;, $method = &#39;GET&#39;){
        $opts = array(
            CURLOPT_TIMEOUT        => 30,
            CURLOPT_RETURNTRANSFER => 1,
            CURLOPT_SSL_VERIFYPEER => false,
            CURLOPT_SSL_VERIFYHOST => false,
        );    
        /* 根据请求类型设置特定参数 */        $opts[CURLOPT_URL] = $url . &#39;?&#39; . http_build_query($param);    
        if(strtoupper($method) == &#39;POST&#39;){
            $opts[CURLOPT_POST] = 1;
            $opts[CURLOPT_POSTFIELDS] = $data;    
            if(is_string($data)){ //发送JSON数据                $opts[CURLOPT_HTTPHEADER] = array(                    &#39;Content-Type: application/json; charset=utf-8&#39;,                    &#39;Content-Length: &#39; . strlen($data),
                );
            }
        }    
        /* 初始化并执行curl请求 */        $ch = curl_init();        curl_setopt_array($ch, $opts);        $data  = curl_exec($ch);
        $error = curl_error($ch);        curl_close($ch);    
        //发生错误，抛出异常        if($error) throw new \Exception(&#39;请求发生错误：&#39; . $error);    
        return  $data;
    }    private function getResult($key){
        $rst[&#39;30&#39;] = &#39;密码错误&#39;;
        $rst[&#39;40&#39;] = &#39;账号不存在&#39;;
        $rst[&#39;41&#39;] = &#39;余额不足&#39;;
        $rst[&#39;42&#39;] = &#39;帐号过期&#39;;
        $rst[&#39;43&#39;] = &#39;IP地址限制&#39;;
        $rst[&#39;50&#39;] = &#39;内容含有敏感词&#39;;
        $rst[&#39;51&#39;] = &#39;手机号码不正确&#39;;        return $rst[$key];
    }

}