<?php
//看代码 
//1、新建qrcode.php
//2、拷贝上面代码进去
//3、修改APPID和APPSECRET
//4、访问qrcode.php
//https://developers.weixin.qq.com/community/develop/doc/0002c4fd87c2d8600917964865ec04
header('content-type:text/html;charset=utf-8');
//配置APPID、APPSECRET
$APPID ="APPID";
$APPSECRET = "APPSECRET";
//获取access_token
$access_token ="https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$APPID&secret=$APPSECRET";
 
//缓存access_token
 session_start();
 $_SESSION['access_token'] ="";
 $_SESSION['expires_in'] = 0;
 
 $ACCESS_TOKEN ="";
 if(!isset($_SESSION['access_token']) || (isset($_SESSION['expires_in']) && time() >$_SESSION['expires_in']))
 {
 
     $json = httpRequest($access_token );
     $json = json_decode($json,true);
     // var_dump($json);
     $_SESSION['access_token'] =$json['access_token'];
     $_SESSION['expires_in'] = time()+7200;
     $ACCESS_TOKEN =$json["access_token"];
 }
 else{
 
     $ACCESS_TOKEN = $_SESSION["access_token"];
 }
 
//构建请求二维码参数
//path是扫描二维码跳转的小程序路径，可以带参数?id=xxx
//width是二维码宽度
$qcode ="https://api.weixin.qq.com/cgi-bin/wxaapp/createwxaqrcode?access_token=$ACCESS_TOKEN";
$param = json_encode(array("path"=>"pages/index/index?id=123","width"=> 150));
 
//POST参数
$result = httpRequest($qcode,$param,"POST");
//生成二维码
file_put_contents("qrcode.png",$result);
$base64_image ="data:image/jpeg;base64,".base64_encode($result );
 
//把请求发送到微信服务器换取二维码
  function httpRequest($url,$data='',$method='GET'){
    $curl = curl_init(); 
    curl_setopt($curl, CURLOPT_URL,$url); 
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0); 
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0); 
    curl_setopt($curl, CURLOPT_USERAGENT,$_SERVER['HTTP_USER_AGENT']); 
    curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1); 
    curl_setopt($curl, CURLOPT_AUTOREFERER, 1); 
    if($method=='POST')
    {
        curl_setopt($curl, CURLOPT_POST, 1);
        if ($data !='')
        {
            curl_setopt($curl, CURLOPT_POSTFIELDS,$data); 
        }
    }
 
    curl_setopt($curl, CURLOPT_TIMEOUT, 30); 
    curl_setopt($curl, CURLOPT_HEADER, 0); 
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1); 
    $result = curl_exec($curl); 
    curl_close($curl); 
    return $result;
  }
 
?>