php生成带参数微信小程序二维码

<?php
class wxcode {
    private $appid;
    private $secret;
    private $id;
    private $width;

    public function __construct($appid = '', $secret = '', $id = 0, $width = '430')
    {
        $this->appid = $appid;
        $this->secret = $secret;
        $this->id = $id;
        $this->width = $width;
    }

    //获取access_token
    public function get_access_token()
    {
        $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=".$this->appid."&secret=".$this->secret;
        return $data = $this->curl_get($url);
    }

    public function curl_get($url) {
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        $data = curl_exec($curl);
        $err = curl_error($curl);
        curl_close($curl);
        return $data;
    }
    
    //获得二维码
    public function get_qrcode() {
        //header('content-type:image/gif');
        //header('content-type:image/png');格式自选，不同格式貌似加载速度略有不同，想加载更快可选择jpg
        header('content-type:image/jpg');
        $id = $this->id;
        $data = array();
        $data['scene'] = "id=".$id;
        $data['page'] = "pages/product/show";  //参数跳转到product/show，产品详情
        $data['width'] = $his->width;
        $data = json_encode($data);
        $access = json_decode($this->get_access_token(),true);
        $access_token= $access['access_token'];
        $url = "https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=" . $access_token;
        $da = $this->get_http_array($url,$data);
    }
    public function get_http_array($url,$post_data) {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        // curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);   //没有这个会自动输出，不用print_r();也会在后面多个1
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
        $output = curl_exec($ch);
        curl_close($ch);
        $out = json_decode($output);
        return $out;
    }
}