【Api】看看PHP是如何实现微信扫码支付的。

PHP微信扫码支付接入也不是很复杂，前期需要先配置与引入文件，这里首先先分两步和大家讲解一下

生成二维码扫码图片，这里需要配置商户ID，appid和秘钥，再调用wxpay类，生成二维码

header('Content-type:text/html; Charset=utf-8');
$mchid = 'xxxxx'; //微信支付商户号 PartnerID 通过微信支付商户资料审核后邮件发送
$appid = 'xxxxx'; //公众号APPID 通过微信支付商户资料审核后邮件发送
$apiKey = 'xxxxx'; //https://pay.weixin.qq.com 帐户设置-安全设置-API安全-API密钥-设置API密钥
$wxPay = new WxpayService($mchid,$appid,$apiKey);
$outTradeNo = uniqid(); //你自己的商品订单号
$payAmount = 0.01; //付款金额，单位:元
$orderName = '支付测试'; //订单标题
$notifyUrl = 'https://www.xxx.com/wx/'; //付款成功后的回调地址(不要有问号)
$payTime = time(); //付款时间
$arr = $wxPay->createJsBizPackage($payAmount,$outTradeNo,$orderName,$notifyUrl,$payTime);
//生成二维码
$url = 'http://qr.liantu.com/api.php?text='.$arr['code_url'];
echo "<img src='{$url}' style='width:300px;'>";

以下是wxpay类，和回调函数都整合在一起了，notify方法是回调地址调用的方法，比如：http://www.xxx.com/wx/notify.php，付款成功后，微信服务器会将付款结果通知到该页面。

class WxpayService
{
 protected $mchid;
 protected $appid;
 protected $apiKey;
 public function __construct($mchid, $appid, $key)
 {
 $this->mchid = $mchid;
 $this->appid = $appid;
 $this->apiKey = $key;
 }
 /**
 * 发起订单
 * @param float $totalFee 收款总费用 单位元
 * @param string $outTradeNo 唯一的订单号
 * @param string $orderName 订单名称
 * @param string $notifyUrl 支付结果通知url 不要有问号
 * @param string $timestamp 订单发起时间
 * @return array
 */
 public function createJsBizPackage($totalFee, $outTradeNo, $orderName, $notifyUrl, $timestamp)
 {
 $config = array(
 'mch_id' => $this->mchid,
 'appid' => $this->appid,
 'key' => $this->apiKey,
 );
 $orderName = iconv('GBK','UTF-8',$orderName);
 $unified = array(
 'appid' => $config['appid'],
 'attach' => 'pay', //商家数据包，原样返回，如果填写中文，请注意转换为utf-8
 'body' => $orderName,
 'mch_id' => $config['mch_id'],
 'nonce_str' => self::createNonceStr(),
 'notify_url' => $notifyUrl,
 'out_trade_no' => $outTradeNo,
 'spbill_create_ip' => '127.0.0.1',
 'total_fee' => intval($totalFee * 100), //单位 转为分
 'trade_type' => 'NATIVE',
 );
 $unified['sign'] = self::getSign($unified, $config['key']);
 $responseXml = self::curlPost('https://api.mch.weixin.qq.com/pay/unifiedorder', self::arrayToXml($unified));
 $unifiedOrder = simplexml_load_string($responseXml, 'SimpleXMLElement', LIBXML_NOCDATA);
 if ($unifiedOrder === false) {
 die('parse xml error');
 }
 if ($unifiedOrder->return_code != 'SUCCESS') {
 die($unifiedOrder->return_msg);
 }
 if ($unifiedOrder->result_code != 'SUCCESS') {
 die($unifiedOrder->err_code);
 }
 $codeUrl = (array)($unifiedOrder->code_url);
 if(!$codeUrl[0]) exit('get code_url error');
 $arr = array(
 "appId" => $config['appid'],
 "timeStamp" => $timestamp,
 "nonceStr" => self::createNonceStr(),
 "package" => "prepay_id=" . $unifiedOrder->prepay_id,
 "signType" => 'MD5',
 "code_url" => $codeUrl[0],
 );
 $arr['paySign'] = self::getSign($arr, $config['key']);
 return $arr;
 }
 public function notify()
 {
 $config = array(
 'mch_id' => $this->mchid,
 'appid' => $this->appid,
 'key' => $this->apiKey,
 );
 $postStr = $GLOBALS["HTTP_RAW_POST_DATA"];
 $postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
 if ($postObj === false) {
 die('parse xml error');
 }
 if ($postObj->return_code != 'SUCCESS') {
 die($postObj->return_msg);
 }
 if ($postObj->result_code != 'SUCCESS') {
 die($postObj->err_code);
 }
 $arr = (array)$postObj;
 unset($arr['sign']);
 if (self::getSign($arr, $config['key']) == $postObj->sign) {
 echo '<xml><return_code><![CDATA[SUCCESS]]></return_code><return_msg><![CDATA[OK]]></return_msg></xml>';
 return $postObj;
 }
 }
 /**
 * curl get
 *
 * @param string $url
 * @param array $options
 * @return mixed
 */
 public static function curlGet($url = '', $options = array())
 {
 $ch = curl_init($url);
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt($ch, CURLOPT_TIMEOUT, 30);
 if (!empty($options)) {
 curl_setopt_array($ch, $options);
 }
 //https请求 不验证证书和host
 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
 curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
 $data = curl_exec($ch);
 curl_close($ch);
 return $data;
 }
 public static function curlPost($url = '', $postData = '', $options = array())
 {
 if (is_array($postData)) {
 $postData = http_build_query($postData);
 }
 $ch = curl_init();
 curl_setopt($ch, CURLOPT_URL, $url);
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 curl_setopt($ch, CURLOPT_POST, 1);
 curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
 curl_setopt($ch, CURLOPT_TIMEOUT, 30); //设置cURL允许执行的最长秒数
 if (!empty($options)) {
 curl_setopt_array($ch, $options);
 }
 //https请求 不验证证书和host
 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
 curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
 $data = curl_exec($ch);
 curl_close($ch);
 return $data;
 }
 public static function createNonceStr($length = 16)
 {
 $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
 $str = '';
 for ($i = 0; $i < $length; $i++) {
 $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
 }
 return $str;
 }
 public static function arrayToXml($arr)
 {
 $xml = "<xml>";
 foreach ($arr as $key => $val) {
 if (is_numeric($val)) {
 $xml .= "<" . $key . ">" . $val . "</" . $key . ">";
 } else
 $xml .= "<" . $key . "><![CDATA[" . $val . "]]></" . $key . ">";
 }
 $xml .= "</xml>";
 return $xml;
 }
 /**
 * 获取签名
 */
 public static function getSign($params, $key)
 {
 ksort($params, SORT_STRING);
 $unSignParaString = self::formatQueryParaMap($params, false);
 $signStr = strtoupper(md5($unSignParaString . "&key=" . $key));
 return $signStr;
 }
 protected static function formatQueryParaMap($paraMap, $urlEncode = false)
 {
 $buff = "";
 ksort($paraMap);
 foreach ($paraMap as $k => $v) {
 if (null != $v && "null" != $v) {
 if ($urlEncode) {
 $v = urlencode($v);
 }
 $buff .= $k . "=" . $v . "&";
 }
 }
 $reqPar = '';
 if (strlen($buff) > 0) {
 $reqPar = substr($buff, 0, strlen($buff) - 1);
 }
 return $reqPar;
 }
}

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