微信小程序支付

public function http_get($url){
    $ch = curl_init($url);
    curl_setopt($ch,CURLOPT_HEADER,0);
    curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
    curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,0);
    curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,0);
    curl_setopt($ch,CURLOPT_TIMEOUT,60);
    $data = curl_exec($ch);
    curl_close($ch);
    return json_decode($data,true);
}

//curl的post请求
public function postCurl($url,$data,$type){
    if($type == 'json'){
        $data = json_encode($data);//对数组进行json编码
        $header= array("Content-type: application/json;charset=UTF-8","Accept: application/json","Cache-Control: no-cache", "Pragma: no-cache");
    }
    $curl = curl_init();
    curl_setopt($curl,CURLOPT_URL,$url);
    curl_setopt($curl,CURLOPT_POST,1);
    curl_setopt($curl,CURLOPT_SSL_VERIFYPEER,false);
    curl_setopt($curl,CURLOPT_SSL_VERIFYHOST,false);
    if(!empty($data)){
        curl_setopt($curl,CURLOPT_POSTFIELDS,$data);
    }
    curl_setopt($curl,CURLOPT_RETURNTRANSFER,1);
    curl_setopt($curl,CURLOPT_HTTPHEADER,$header);
    $res = curl_exec($curl);
    if(curl_errno($curl)){
        echo 'Error+'.curl_error($curl);
    }
    curl_close($curl);
    return $res;
}

//POST方式调用微信小程序 支付/提现 接口
public function curl_post_ssl($url, $xmldata, $second=30,$aHeader=array()){
    $ch = curl_init();
    curl_setopt($ch,CURLOPT_TIMEOUT,$second);
    curl_setopt($ch,CURLOPT_RETURNTRANSFER, 1);
    //这里设置代理，如果有的话
    //curl_setopt($ch,CURLOPT_PROXY, '10.206.30.98');
    //curl_setopt($ch,CURLOPT_PROXYPORT, 8080);
    curl_setopt($ch,CURLOPT_URL,$url);
    curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,false);
    curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,false);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $aHeader);
    curl_setopt($ch,CURLOPT_POST, 1);
    curl_setopt($ch,CURLOPT_POSTFIELDS,$xmldata);
    $data = curl_exec($ch);
    if(curl_errno($ch)){
        echo 'Error+'.curl_error($ch);
    }
    curl_close($ch);
    return $data;
}

public function curl_post_ssl2($url, $xmldata, $second=30,$aHeader=array()){
    $isdir = str_replace('Api.php','',__FILE__) . 'cert/';

    $ch = curl_init();
    curl_setopt($ch,CURLOPT_TIMEOUT,$second);
    curl_setopt($ch,CURLOPT_RETURNTRANSFER, 1);
    //这里设置代理，如果有的话
    //curl_setopt($ch,CURLOPT_PROXY, '10.206.30.98');
    //curl_setopt($ch,CURLOPT_PROXYPORT, 8080);
    curl_setopt($ch,CURLOPT_URL,$url);
    curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,false);
    curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,false);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $aHeader);

    curl_setopt($ch, CURLOPT_SSLCERTTYPE, 'PEM');//证书类型
    curl_setopt($ch, CURLOPT_SSLCERT, $isdir . 'apiclient_cert.pem');//证书位置
    curl_setopt($ch, CURLOPT_SSLKEYTYPE, 'PEM');//CURLOPT_SSLKEY中规定的私钥的加密类型
    curl_setopt($ch, CURLOPT_SSLKEY, $isdir . 'apiclient_key.pem');//证书位置
    curl_setopt($ch, CURLOPT_CAINFO, 'PEM');
    //curl_setopt($ch, CURLOPT_CAINFO, $isdir . 'rootca.pem');这个是可选的

    curl_setopt($ch,CURLOPT_POST, 1);
    curl_setopt($ch,CURLOPT_POSTFIELDS,$xmldata);
    $data = curl_exec($ch);
    if(curl_errno($ch)){
        echo 'Error+'.curl_error($ch);
    }
    curl_close($ch);
    return $data;
}

//商户系统内部订单号，要求32个字符内
public function getNonceStr($length = 32) {
    $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
    $str = "";
    for ( $i = 0; $i < $length; $i++ ) {
        $str .= substr($chars, mt_rand(0, strlen($chars)-1), 1);
    }
    return $str;
}

//获取IP地址
public function getip() {
    static $ip = '';
    $ip = $_SERVER['REMOTE_ADDR'];
    if(isset($_SERVER['HTTP_CDN_SRC_IP'])) {
        $ip = $_SERVER['HTTP_CDN_SRC_IP'];
    } elseif (isset($_SERVER['HTTP_CLIENT_IP']) && preg_match('/^([0-9]{1,3}.){3}[0-9]{1,3}$/', $_SERVER['HTTP_CLIENT_IP'])) {
        $ip = $_SERVER['HTTP_CLIENT_IP'];
    } elseif(isset($_SERVER['HTTP_X_FORWARDED_FOR']) AND preg_match_all('#d{1,3}.d{1,3}.d{1,3}.d{1,3}#s', $_SERVER['HTTP_X_FORWARDED_FOR'], $matches)) {
        foreach ($matches[0] AS $xip) {
            if (!preg_match('#^(10|172.16|192.168).#', $xip)) {
                $ip = $xip;
                break;
            }
        }
    }
    return $ip;
}

//生成签名
public function makeSign($data){
    //获取微信支付秘钥
    $key = "";
    // 去空
    $data=array_filter($data);
    //签名步骤一：按字典序排序参数
    ksort($data);
    $string_a=http_build_query($data);
    $string_a=urldecode($string_a);
    //签名步骤二：在string后加入KEY
    $string_sign_temp=$string_a."&key=".$key;
    //签名步骤三：MD5加密
    $sign = md5($string_sign_temp);
    // 签名步骤四：所有字符转为大写
    $result=strtoupper($sign);
    return $result;
}

/**
 * 将一个数组转换为 XML 结构的字符串
 * @param array $arr 要转换的数组
 * @param int $level 节点层级, 1 为 Root.
 * @return string XML 结构的字符串
 */
public function array2xml($arr, $level = 1) {
    $s = $level == 1 ? "<xml>" : '';
    foreach($arr as $tagname => $value) {
        if (is_numeric($tagname)) {
            $tagname = $value['TagName'];
            unset($value['TagName']);
        }
        if(!is_array($value)) {
            $s .= "<{$tagname}>".(!is_numeric($value) ? '<![CDATA[' : '').$value.(!is_numeric($value) ? ']]>' : '')."</{$tagname}>";
        } else {
            $s .= "<{$tagname}>" . $this->array2xml($value, $level + 1)."</{$tagname}>";
        }
    }
    $s = preg_replace("/([x01-x08x0b-x0cx0e-x1f])+/", ' ', $s);
    return $level == 1 ? $s."</xml>" : $s;
}

//将xml转为array
public function xml2array($xml){
//禁止引用外部xml实体
    libxml_disable_entity_loader(false);
    $result= json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
    return $result;
}

public function wxPay(Request $request){
    $uid = $request->param('uid');
    $openid = Db::name('member')->where('id',$uid)->value('wxopenid');

    $data = [
        'appid' => '',
        'mch_id' => '',//商户号
        'nonce_str' => self::getNonceStr(),//随机字符串，长度要求在32位以内
        'body' => '互帮互带_福豆充值',//商品描述
        'out_trade_no' => self::create_order_no(),//商户订单号
        'total_fee' => 1,//标价金额，单位分
        'spbill_create_ip' => self::getip(),//终端IP
        'notify_url' => config('website').'/api/v3.api/wxNotify',//通知地址
        'trade_type' => 'JSAPI',//交易类型
        'openid' => $openid
    ];

    $data['sign'] = self::makeSign($data);

    $xmldata = self::array2xml($data);
    $url = "https://api.mch.weixin.qq.com/pay/unifiedorder";
    $res = self::curl_post_ssl($url, $xmldata);

    if (empty($res)) {
        return json(['status'=>0,'data'=>'','msg'=>'连接失败']);
    }

    $content = self::xml2array($res);

    $return_code = strval($content['return_code']);
    $result_code = strval($content['result_code']);

    if ($return_code == 'FAIL') {
        return json(['status'=>0,'data'=>'','msg'=>$return_code]);
    }

    if ($result_code == 'FAIL') {
        return ['status' => 1, 'msg' => strval($content['err_code']), ':' . strval($content['err_code_des'])];
    }

    //第二次签名
    $timest = (string)time();

    $resdata = [
        'appId' => '',
        'package' => 'prepay_id='.strval($content['prepay_id']),
        'nonceStr' => self::getNonceStr(),
        'timeStamp' => $timest,
        'signType' => 'MD5'
    ];

    $resdata['paySign'] = self::makeSign($resdata);

    return json(['status'=>1,'data'=>$resdata,'msg'=>'查询支付参数成功']);
}

//回调
public function wxNotify()
{
    //真的成功支付之后，才会触发这个回调方法
    $notify = file_get_contents("php://input");
    $data = self::xml2array($notify);

}