网上的很多PHP微信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支付的带来些许帮助和借鉴意义。
需要注意的事项：
1.微信现金红包要求必传证书，需要到 账户中心->账户设置->API安全->下载证书，然后修改代码中的证书路径
2.默认的使用场景是抽奖（即scene_id参数为PRODUCT_2），额度是1-200元，所以测试时的最低金额是1元。如需修改在产品中心->产品大全->现金红包->产品设置中修改
3.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。
5.错误码参照 ：
代码如下：
//①、获取当前访问页面的用户openid（如果给指定用户发送红包，则填写指定用户的openid)
$wxPay = new WxpayService($mchid,$appid,$appKey,$apiKey);
$openId = $wxPay->GetOpenid(); //获取openid
if(!$openId) exit('获取openid失败');
//②、发送红包
$outTradeNo = uniqid(); //你自己的商品订单号
$payAmount = 1; //红包金额，单位:元
$sendName = '织梦猫'; //红包发送者名称
$wishing = '感谢您参加猜灯谜活动，祝您元宵节快乐！'; //红包祝福语
$act_name='猜灯谜抢红包活动'; //活动名称
$result = $wxPay->createJsBizPackage($openId,$payAmount,$outTradeNo,$sendName,$wishing,$act_name);
echo 'success';
class WxpayService
{
protected $mchid;
protected $appid;
protected $appKey;
protected $apiKey;
public $data = null;
public function __construct($mchid,$key)
{
$this->mchid = $mchid;
$this->appid = $appid;
$this->appKey = $appKey;
$this->apiKey = $key;
}
/**
- 通过跳转获取用户的openid，跳转流程如下：
- 1、设置自己需要调回的url及其其他参数，跳转到微信服务器https://open.weixin.qq.com/connect/oauth2/authorize
- 2、微信服务处理完成之后会跳转回用户redirect_uri地址，此时会带上一些参数，如：code
- @return 用户的openid
*/
public function GetOpenid()
{
//通过code获得openid
if (!isset($_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;
}
/**
- 发送红包
- @param string $openid 用户在该公众号下的Openid
- @param float $totalFee 红包金额 单位元
- @param string $outTradeNo 订单号
- @param string $orderName 红包发送者名称
- @param string $wishing 祝福语
- @param string $actName 互动名称
- @return string
/
public function createJsBizPackage($openid,$totalFee,$actName)
{
$config = array(
'mch_id' => $this->mchid,'appid' => $this->appid,'key' => $this->apiKey,);
$unified = array(
'wxappid' => $config['appid'],'send_name' => $sendName,'mch_id' => $config['mch_id'],'nonce_str' => self::createNonceStr(),'re_openid' => $openid,'mch_billno' => $outTradeNo,'client_ip' => '127.0.0.1','total_amount' => intval($totalFee 100),//单位 转为分
'total_num'=>1,//红包发放总人数
'wishing'=>$wishing,//红包祝福语
'act_name'=>$actName,//活动名称
'remark'=>'remark',//备注信息，如为中文注意转为UTF8编码
'scene_id'=>'PRODUCT_2',//发放红包使用场景，红包金额大于200时必传。https://pay.weixin.qq.com/wiki/doc/api/tools/cash_coupon.php?chapter=13_4&index=3
);
$unified['sign'] = self::getSign($unified,$config['key']);
$responseXml = $this->curlPost('https://api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack',self::arrayToXml($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($unifiedOrder->err_code);
}
return true;
}
public static function curlGet($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 $data;
}
public function curlPost($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_POST,CURLOPT_POSTFIELDS,$postData);
curl_setopt($ch,30); //设置cURL允许执行的最长秒数
if (!empty($options)) {
curl_setopt_array($ch,false);
//第一种方法，cert 与 key 分别属于两个.pem文件
//默认格式为PEM，可以注释
curl_setopt($ch,CURLOPT_SSLCERTTYPE,'PEM');
curl_setopt($ch,CURLOPT_SSLCERT,getcwd().'/cert/apiclient_cert.pem');
//默认格式为PEM，可以注释
curl_setopt($ch,CURLOPT_SSLKEYTYPE,CURLOPT_SSLKEY,getcwd().'/cert/apiclient_key.pem');
//第二种方式，两个文件合成一个.pem文件
// curl_setopt($ch,getcwd().'/all.pem');
$data = curl_exec($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)
{
$xml = "
foreach ($arr as $key => $val) {
if (is_numeric($val)) {
$xml .= "<" . $key . ">" . $val . "</" . $key . ">";
} else
$xml .= "<" . $key . "><![CDATA[" . $val . "]]></" . $key . ">";
}
$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,strlen($buff) - 1);
}
return $reqPar;
}
}
?>
