微信扫码支付

<?php
    //生成二维码图像类  参考        https://www.cnblogs.com/mengor/p/8192642.html
    require_once './phpqrcode/phpqrcode.php';

    define('APPID','123123123');
    define('MCHID','456456');
    define('KEY','789789');

    $data['appid']=APPID;                               //微信分配的公众账号ID
    $data['mch_id']=MCHID;                              //微信支付分配的商户号
    $data['time_stamp']=time();                         //系统当前时间，定义规则详见时间戳
    $data['nonce_str']=uniqid();                        //随机字符串，不长于32位。推荐随机数生成算法
    $data['out_trade_no']=time().rand('1111','9999');     //商户定义的商品id 或者订单号
    $data['body']='龙测试';                             //商品信息
    $data['trade_type']='NATIVE';                       //交易类型
    $data['total_fee']=1;                               //支付金额          单位分
    $data['spbill_create_ip']='117.34.40.95';
    $data['notify_url']='www.guomeng.group/index/way_login/pay';        //外网地址
          
    $sign=createSign($data);               
    $data['sign']=$sign;                                 //签名
    $data=dataToXml($data);                               //转xml
    $request=request($url='https://api.mch.weixin.qq.com/pay/unifiedorder',$https=true,$method='post',$data);               //将数据发送到微信服务器
    $obj=simplexml_load_string($request);
    $erweima_url=$obj->code_url;                //将链接转成二维码
    qrcode($erweima_url);                   //生成图片二维码



    //生成签名
    function createSign($data){
        $string='';
        ksort($data);
        foreach($data as $key=>$value){
            $string.="{$key}={$value}&";
        }
        $string.='key='.KEY;
        return strToUpper(md5($string));
    }

    //转xml
    function dataToXml($data){
        $xml='<xml>';
        foreach($data as $key=>$value){
            $xml.="<{$key}>{$value}</{$key}>";
        }
        $xml.='</xml>';
        return $xml;
    }

    //curl发送请求
    function request($url,$https,$method,$data){
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        if($https==true){
            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER,false);
            curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
        }
        if($method=='post'){
            curl_setopt($ch, CURLOPT_POST, 1);
            curl_setopt($ch, CURLOPT_POSTFIELDS,$data);
        }
        $result = curl_exec($ch);
        curl_close($ch);
        return $result;
    }

    //生成二维码
    function qrcode($url=''){
        $value = $url;                  //二维码内容  
        $errorCorrectionLevel = 'L';    //容错级别   
        $matrixPointSize = 5;           //生成图片大小    
        //生成二维码图片  
        $QR = QRcode::png($value,false,$errorCorrectionLevel, $matrixPointSize, 2);  
    }  

发送成功后微信服务器会返回xml数据