php小程序生成二维码

 <?php

 getwxacode();

     //生成二维码
     function getwxacode(){
         $url = "https://api.weixin.qq.com/wxa/getwxacode?";
         $url .= "access_token=" . getToken();
         $postdata = [
             "path" => "pages/index/index?clientId=3",
             "width" => ,
         ];

         $res = curl_post($url,json_encode($postdata),$options=array());
         $img = './img/'.time().'.jpg';
         $r = file_put_contents($img,$res);
         echo "<img src='".$img."'>";

     }

     //发送获取token请求,获取token(2小时)
     function getToken() {
         $url = getTokenUrlStr();
         $res = curl_post($url,$postdata='',$options=array());

         $data = json_decode($res,JSON_FORCE_OBJECT);
         return $data['access_token'];
     }

     //获取token的url参数拼接
     function getTokenUrlStr()
     {
         $getTokenUrl = "https://api.weixin.qq.com/cgi-bin/token?"; //获取token的url
         $WXappid     =  "wx0399845015067c51"; //APPID
         $WXsecret    = "7d7205f85b79805006ecfa2121ef4272"; //secret
         $str  = $getTokenUrl;
         $str .= "grant_type=client_credential&";
         $str .= "appid=" . $WXappid . "&";
         $str .= "secret=" . $WXsecret;

         return $str;
     }

     function curl_post($url='',$postdata='',$options=array()){
         $ch=curl_init($url);
         curl_setopt($ch,CURLOPT_RETURNTRANSFER,);
         curl_setopt($ch,CURLOPT_POST,);
         curl_setopt($ch, CURLOPT_POSTFIELDS, $postdata);
         curl_setopt($ch, CURLOPT_TIMEOUT, );
         curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
         curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
         if(!empty($options)){
             curl_setopt_array($ch, $options);
         }
         $data=curl_exec($ch);
         curl_close($ch);
         return $data;
     }

     function curl_get($url='',$options=array()){
         $ch=curl_init($url);
         curl_setopt($ch,CURLOPT_RETURNTRANSFER,);
         curl_setopt($ch,CURLOPT_TIMEOUT,);
         if(!empty($options)){
             curl_setopt_array($ch,$options);
         }
         $data=curl_exec($ch);
         curl_close($ch);
         return $data;
     }