小程序生成带推荐码(场景id)的二维码

<?php
namespace BusinessController;
use ThinkHook;

/**
 * 小程序码[带推荐码/场景id]
 * @author 戈丫汝<534208139@qq.com>
 */
class XcxqrcodeController{
    protected $appid = '';
    protected $secret = '';
    protected $url = "";
    protected $access_tokens = "";

    public function __construct(){
        $mpid = $_GET['mpid'];
        $appid = M('test')->where(['mpid'=>$mpid,'name'=>'xcx_appid'])->getField('value');
        $appsecret = M('test')->where(['mpid'=>$mpid,'name'=>'xcx_appsecret'])->getField('value');
        $this->appid = $appid;
        $this->secret = $appsecret;
        $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" . $this->appid . "&secret=" . $this->secret . "";
        $result = $this->httpRequest($url);
        $access_tokens = json_decode($result, true);
        $this->access_tokens = $access_tokens['access_token'];
    }
    //打印二维码显示  [[入口地址]]
    public function Follow(){
        $scene_str = $_GET['id'];//场景id/推荐码
        $mpid = $_GET['mpid'];
        $rs = $this->getTemporaryQrcode($mpid,$this->access_tokens, $scene_str);
        echo $rs;
    }
    //生成二维码
    public function getTemporaryQrcode($mpid,$access_tokens,$scene_str=''){
        //首页小程序码。无path
        $qcode ="https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=".$access_tokens. "";
        $param = json_encode(array("scene"=>$scene_str));
        $result = $this->httpRequest( $qcode, $param,"POST");
        $filename =  './Images/'.'xcx_'.$mpid.'-'.uniqid() . '.jpg'; //定义图片名字及格式 
        file_put_contents($filename,$result);  
        return $filename;
    }
    //把请求发送到微信服务器换取二维码
    function httpRequest($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;
    } 
}

 小程序端场景id接收,走接口绑定

注意参数获取方式

业务场景较多的小程序码，使用getwxacodeunlimit获取，其参数需要注意，可不是?id=2，
扫码访问内容页面，在页面的onload方法中，解析小程序码的参数

比如要传入一个用户id=12，scene参数就可以写成"12"，多个参数按一定规则分开，如&符号，第二个参数是shop_id=3，
则scene可以这样写"12&3"
用户扫码进入后的逻辑

我们可以在该页面的onload生命周期中处理参数
onLoad:function(options){
	if(options.scene){
		let scene=decodeURIComponent(options.scene);
		//&是我们定义的参数链接方式
		let id=scene.split("&")[0];
		let shop_id=scene.split('&')[1];
		//其他逻辑处理。。。。。
	}
}

场景id官方文档要求格式为:

请求带场景id图片地址入口:  /index.php?s=/Xcxqrcode/mpid/22222/id/112

生成图片示例:[生成的二维码默认logo就是小程序的logo,贼方便]