PHP生成不限制数量的带参数的小程序码

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本文介绍了一种使用PHP后端生成微信小程序无限二维码的方法，详细展示了如何通过获取access_token并利用此token请求微信API生成二维码图片，同时提供了将二维码转换为Base64字符串的示例代码。

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PHP后端

<?php

namespace app\index\controller;

use think\Controller;
use think\Db;


class Qrcode extends Controller
{
    public function index()
    {
        header('content-type:text/html;charset=utf-8');
        //配置APPID、APPSECRET
        $APPID = "XXXXX";
        $APPSECRET =  "XXXXX";
        //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'] = "";
        $_SESSION['expires_in'] = 0;
        if(!isset($_SESSION['access_token']) || (isset($_SESSION['expires_in']) && time() > $_SESSION['expires_in']))
        {
            $json = $this->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
        //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
        $qcode ="https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=$ACCESS_TOKEN";
        $id = input('post.id');
        $path = "pages/houseDetail/houseDetail";
        $param = json_encode(array("scene"=>"$id","page"=>"$path","width"=> 150));

        //POST参数
        $result = $this->httpRequest( $qcode, $param,"POST");
        //生成二维码
//        file_put_contents("qrcode.jpg", $result);
        $base64_image ="data:image/jpeg;base64,".base64_encode( $result );
        return $base64_image;
    }

    //把请求发送到微信服务器换取二维码
    public 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（获取scene，进行跳转）

const scene = decodeURIComponent(options.scene)
var hoid = options.id;

if (scene !="undefined"){
hoid = scene;
}