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，只有200行代码，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。
直接运行该文件即可得到一个支付二维码的图片。
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\'; //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;\'>\";
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;
}
}
github下载地址：weixinPay
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