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：
<?php
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\'; //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 = $wxPay->GetOpenid(); //获取openid
if(!$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>
<?php
class 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;
}
}
?>
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