网上的很多PHP微信扫码支付接入教程都颇为复杂，且需要配置和引入较多的文件，本人通过整理后给出一个单文件版的，希望可以给各位想接入微信扫码支付的带来些许帮助和借鉴意义。
将该文件放到你的授权目录下，并在微信里访问这个文件，即可看到演示效果。效果如下：
需要注意的事项：
1.该文件需放到支付授权目录下，可以在微信支付商户平台->产品中心->开发配置中设置。 2.如提示签名错误可以通过微信支付签名验证工具进行验证：微信公众平台支付接口调试工具
代码如下：
<?phpheader("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"; //微信支付申请对应的公众号的APPID$appKey = "xxxxx"; //微信支付申请对应的公众号的APP Key$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//①、获取用户openid$wxPay = new WxpayService($mchid,$appid,$appKey,$apiKey);$openId = $wxPay->GetOpenid(); //获取openidif(!$openId) exit("获取openid失败");//②、统一下单$outTradeNo = uniqid(); //你自己的商品订单号$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)$payTime = time(); //付款时间$jsApiParameters = $wxPay->createJsBizPackage($openId,$payAmount,$outTradeNo,$orderName,$notifyUrl,$payTime);$jsApiParameters = json_encode($jsApiParameters);?> <html> <head> <meta charset="utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1"/> <title>微信支付样例-支付</title> <script type="text/javascript"> //调用微信JS api 支付 function jsApiCall() { WeixinJSBridge.invoke( "getBrandWCPayRequest", <?php echo $jsApiParameters; ?>, function(res){ WeixinJSBridge.log(res.err_msg); alert(res.err_code+res.err_desc+res.err_msg); } ); } function callpay() { if (typeof WeixinJSBridge == "undefined"){ if( document.addEventListener ){ document.addEventListener("WeixinJSBridgeReady", jsApiCall, false); }else if (document.attachEvent){ document.attachEvent("WeixinJSBridgeReady", jsApiCall); document.attachEvent("onWeixinJSBridgeReady", jsApiCall); } }else{ jsApiCall(); } } </script> </head> <body> <br/> <font color="#9ACD32"><b>该笔订单支付金额为<span style="color:#f00;font-size:50px"><?php echo $payAmount?>元</span>钱</b></font><br/><br/> <div align="center"> <button style="width:210px; height:50px; border-radius: 15px;background-color:#FE6714; border:0px #FE6714 solid; cursor: pointer; color:white; font-size:16px;" type="button" onclick="callpay()" >立即支付</button> </div> </body> </html><?phpclass WxpayService{ protected $mchid; protected $appid; protected $appKey; protected $apiKey; public $data = null; public function __construct($mchid, $appid, $appKey,$key) { $this->mchid = $mchid; //https://pay.weixin.qq.com 产品中心-开发配置-商户号 $this->appid = $appid; //微信支付申请对应的公众号的APPID $this->appKey = $appKey; //微信支付申请对应的公众号的APP Key $this->apiKey = $key; //https://pay.weixin.qq.com 帐户设置-安全设置-API安全-API密钥-设置API密钥 } /** * 通过跳转获取用户的openid，跳转流程如下： * 1、设置自己需要调回的url及其其他参数，跳转到微信服务器https://open.weixin.qq.com/connect/oauth2/authorize * 2、微信服务处理完成之后会跳转回用户redirect_uri地址，此时会带上一些参数，如：code * @return 用户的openid */ public function GetOpenid() { //通过code获得openid if (!isset($_GET["code"])){ //触发微信返回code码 $scheme = $_SERVER["HTTPS"]=="on" ? "https://" : "http://"; $baseUrl = urlencode($scheme.$_SERVER["HTTP_HOST"].$_SERVER["PHP_SELF"].$_SERVER["QUERY_STRING"]); $url = $this->__CreateOauthUrlForCode($baseUrl); Header("Location: $url"); exit(); } else { //获取code码，以获取openid $code = $_GET["code"]; $openid = $this->getOpenidFromMp($code); return $openid; } } /** * 通过code从工作平台获取openid机器access_token * @param string $code 微信跳转回来带上的code * @return openid */ public function GetOpenidFromMp($code) { $url = $this->__CreateOauthUrlForOpenid($code); $res = self::curlGet($url); //取出openid $data = json_decode($res,true); $this->data = $data; $openid = $data["openid"]; return $openid; } /** * 构造获取open和access_toke的url地址 * @param string $code，微信跳转带回的code * @return 请求的url */ private function __CreateOauthUrlForOpenid($code) { $urlObj["appid"] = $this->appid; $urlObj["secret"] = $this->appKey; $urlObj["code"] = $code; $urlObj["grant_type"] = "authorization_code"; $bizString = $this->ToUrlParams($urlObj); return "https://api.weixin.qq.com/sns/oauth2/access_token?".$bizString; } /** * 构造获取code的url连接 * @param string $redirectUrl 微信服务器回跳的url，需要url编码 * @return 返回构造好的url */ private function __CreateOauthUrlForCode($redirectUrl) { $urlObj["appid"] = $this->appid; $urlObj["redirect_uri"] = "$redirectUrl"; $urlObj["response_type"] = "code"; $urlObj["scope"] = "snsapi_base"; $urlObj["state"] = "STATE"."#wechat_redirect"; $bizString = $this->ToUrlParams($urlObj); return "https://open.weixin.qq.com/connect/oauth2/authorize?".$bizString; } /** * 拼接签名字符串 * @param array $urlObj * @return 返回已经拼接好的字符串 */ private function ToUrlParams($urlObj) { $buff = ""; foreach ($urlObj as $k => $v) { if($k != "sign") $buff .= $k . "=" . $v . "&"; } $buff = trim($buff, "&"); return $buff; } /** * 统一下单 * @param string $openid 调用【网页授权获取用户信息】接口获取到用户在该公众号下的Openid * @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 $timestamp 支付时间 * @return string */ public function createJsBizPackage($openid, $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, "openid" => $openid, //rade_type=JSAPI，此参数必传 "out_trade_no" => $outTradeNo, "spbill_create_ip" => "127.0.0.1", "total_fee" => intval($totalFee * 100), //单位 转为分 "trade_type" => "JSAPI", ); $unified["sign"] = self::getSign($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); } $arr = array( "appId" => $config["appid"], "timeStamp" => "$timestamp", //这里是字符串的时间戳，不是int，所以需加引号 "nonceStr" => self::createNonceStr(), "package" => "prepay_id=" . $unifiedOrder->prepay_id, "signType" => "MD5", ); $arr["paySign"] = self::getSign($arr, $config["key"]); return $arr; } public static function curlGet($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 . ">"; } $xml .= "</xml>"; file_put_contents("1.txt",$xml); return $xml; } public static function getSign($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; }}?>github下载地址
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