开发文档地址：https://developers.weixin.qq.com/miniprogram/dev/api-backend/open-api/url-scheme/urlscheme.generate.html

流程：
1、获取accesstoken。
2、根据文档获取一个 weixin: 开头的链接地址，直接前端 window.localtion.href 跳转即可！

注意事项：
1、accesstoken获取的时间
2、jump_wxa 参数传递的格式要跟文档一致，query只能传递 数字字符格式，有长度限制！

上代码：

private $post_url = "https://api.weixin.qq.com/wxa/generatescheme?access_token=";

    private $appid="要跳转的小程序appid";
    private $appsercet = "要跳转的小程序appsercet";
                          
    private $path ="/pages/index";
    private $env_version ="develop"; //正式版为"release"，体验版为"trial"，开发版为"develop"

//获取微信返回的跳转地址
    public function get_url(){

        $data = $_POST;
        if(!$data['order_id']){
            return show(0,"信息有误！");
        }
        $access_token = $this->getAsstoken();
     
        $dataa = [
            "jump_wxa" => [
                "path" => $this->path,
                "query" => "跳转到小程序所带的参数（只能传递数字字符）"
            ],
            "expire_time" => 1672502399
        ];
        
        $jump_url = $this->post_url.$access_token;
        $res = $this->sendPOSTRequest($jump_url,json_encode($dataa));
        var_dump($res);
    }

//获取accesstoken
	public function getAsstoken(){
        $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".$this->appid."&secret=".$this->appsercet;
        $result = file_get_contents($url);
        $res = json_decode($result,true);
        return $res['access_token'];
    }

    public function sendPOSTRequest($url, $map_json)
    {
        $ch = curl_init();
        //设置选项，包括URL
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch, CURLOPT_HEADER, 0);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // 信任任何证书
        curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 1); // 检查证书中是否设置域名
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $map_json);
        curl_setopt($ch, CURLOPT_HTTPHEADER, array(
            "content-type: application/json; charset=UTF-8"
        ));
        //执行并获取内容
        $content = curl_exec($ch);
        if ($content === false) {
            echo 'Curl error: ' . curl_error($ch);
        }
        //释放curl句柄
        curl_close($ch);
        return $content;

    }