ThinkPHP V5.0 接入微信支付

微信支付接口

• 组装访问数组

  $data['body'] = '商城购买商品';//订单标题
  $data['out_trade_no'] = generate_rand_str(8, 0);//平台订单号(非小程序订单,自己平台生成的)
  $data['notify_url'] = $this->request->domain().'';//微信支付回调地址,不带参数
  $data['total_fee'] = $price;//价格,单位(元)
  $data['openid'] = $this->user['openid'];//用户openid
  $res = $this->unifiedorder($config['wechat_appid'],$config['wechat_mch_id'],$config['wechat_key'],$data);//访问统一下单

• 统一下单

  /**
  * 统一下单方法
  * $appid 小程序id
  * $mchid 商户号
  * $key 微信支付key
  * $data 信息数组
  * */
  public function unifiedorder($appid,$mch_id,$key,$data)
  {
    $url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';//微信统一下单访问url
    $parameters = array(
        'appid' => $appid, //小程序ID
        'mch_id' => $mch_id, //商户号
        'nonce_str' => generate_rand_str(8, 0), //随机字符串
        'body' => $data['body'], //商品描述
        'out_trade_no' => $data['out_trade_no'], //商户订单号
        'total_fee' => floatval($data['total_fee'] * 100), //总金额 单位 分
        'spbill_create_ip' => $_SERVER['REMOTE_ADDR'], //终端IP
        'notify_url' => $data['notify_url'].'index.php/callback', //通知地址 确保外网能正常访问
        'openid' => $data['openid'], //用户id
        'trade_type' => 'JSAPI'//交易类型//要是返回该产品权限未开通请在产品中心开通jsAPi他包含的小程序支付
    );
    //统一下单签名
    $parameters['sign'] = $this->getSign($parameters,$key);
    $xmlData = $this->arrayToXml($parameters);
    $return = $this->xmlToArray($this->postXmlCurl($xmlData, $url, 60));
    return $return;
  }

生成随机数

/**
 * 生成随机字符串
 * @param int $length 生成长度
 * @param int $type 生成类型：0-小写字母+数字，1-小写字母，2-大写字母，3-数字，4-小写+大写字母，5-小写+大写+数字
 * @return string
 */
function generate_rand_str($length = 8, $type = 0) {
    $a = 'abcdefghijklmnopqrstuvwxyz';
    $A = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $n = '0123456789';

    switch ($type) {
        case 1: $chars = $a; break;
        case 2: $chars = $A; break;
        case 3: $chars = $n; break;
        case 4: $chars = $a.$A; break;
        case 5: $chars = $a.$A.$n; break;
        default: $chars = $a.$n;
    }

    $str = '';
    for ($i = 0; $i < $length; $i++) {
        $str .= $chars[ mt_rand(0, strlen($chars) - 1) ];
    }
    return $str;
}

生成签名

/**
 * 生成签名
 * @param array $Obj 访问数组
 * @param string $key 商户key
 * @return string
 */
public function getSign($Obj,$key) {
    foreach ($Obj as $k => $v) {
        $Parameters[$k] = $v;
    }
    //签名步骤一：按字典序排序参数
    ksort($Parameters);
    $String = $this->formatBizQueryParaMap($Parameters, false);
    //签名步骤二：在string后加入KEY
    $String = $String . "&key=" . $key;
    //签名步骤三：MD5加密
    $String = md5($String);
    //签名步骤四：所有字符转为大写
    $result_ = strtoupper($String);
    return $result_;
}

格式化参数，签名过程需要使用

//作用：格式化参数，签名过程需要使用
public function formatBizQueryParaMap($paraMap, $urlencode) {
    $buff = "";
    ksort($paraMap);
    foreach ($paraMap as $k => $v) {
        if ($urlencode) {
            $v = urlencode($v);
        }
        $buff .= $k . "=" . $v . "&";
    }
    $reqPar = array();
    if (strlen($buff) > 0) {
        $reqPar = substr($buff, 0, strlen($buff) - 1);
    }
    return $reqPar;
}

数组转换成xml

//数组转换成xml
public function arrayToXml($arr) {
    $xml = "<root>";
    foreach ($arr as $key => $val) {
        if (is_array($val)) {
            $xml .= "<" . $key . ">" . $this->arrayToXml($val) . "</" . $key . ">";
        } else {
            $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
        }
    }
    $xml .= "</root>";
    return $xml;
}

xml格式访问

public function postXmlCurl($xml, $url, $second = 30)
{
    $ch = curl_init();
    //设置超时
    curl_setopt($ch, CURLOPT_TIMEOUT, $second);
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
    curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); //严格校验
    //设置header
    curl_setopt($ch, CURLOPT_HEADER, FALSE);
    //要求结果为字符串且输出到屏幕上
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
    //post提交方式
    curl_setopt($ch, CURLOPT_POST, TRUE);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $xml);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);
    curl_setopt($ch, CURLOPT_TIMEOUT, 40);
    set_time_limit(0);
    //运行curl
    $data = curl_exec($ch);
    //返回结果
    curl_close($ch);
    return $data;
}

将xml转换成数组

 public function xmlToArray($xml) {
    //禁止引用外部xml实体
    libxml_disable_entity_loader(true);
    $xmlstring = simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA);
    $val = json_decode(json_encode($xmlstring), true);
    return $val;
}

微信支付成功回调接口

//微信支付回调
public function callback()
{
    $postXml = file_get_contents("php://input");//获取回调的xml格式
    $attr = $this->xmlToArray($postXml);//将获取的xml转为数组
    if($attr['result_code'] == 'SUCCESS'){
        //在此书写支付成功后的逻辑
        return true;
    }else{
        //在此书写支付失败后的逻辑
        return false;
    }
}