PHP通过官方接口生成小程序二维码

因为Sham有计划在各区域放置二维码，用于同事们快速查询相关信息和提交反馈建议，就需要每个二维码都能单独对应该区域。

如果通过官方网站生成的话太麻烦，于是参照官方接口文档，用PHP做了一个，以便快速生成，代码如下：

<?php
    header('content-type:text/html;charset=utf-8');
    //配置APPID、APPSECRET
    $APPID = "你的id";
    $APPSECRET =  "你的secret";
    //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，这个是为了避免重复多次提交导致超限后无法再次获取
    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);
        $_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
    $qcode ="https://api.weixin.qq.com/cgi-bin/wxaapp/createwxaqrcode?access_token=$ACCESS_TOKEN";  
    
    //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
    $param = json_encode(array("path"=>$_GET['page'],"width"=> 500));
    
    //通过curl，POST参数，获取通过官方接口传回的图片数据
    $result = httpRequest( $qcode, $param,"POST");
    //生成二维码
    $base64_image ="data:image/jpeg;base64,".base64_encode( $result );
    
    //输出图片
    echo '<image src="'.$base64_image.'" style="width:500px;height:565px;"></image>';
    
    //通过curl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;
    }
     
?>

然后，你就可以通过这个PHP接口，将page信息传入后就能获取到对应的二维码啦！

当然，你也可以把appid和appsecret设成变量，做成一个开放接口供其他人使用，方便你我他，快乐千万家，^-^