微信普通红包是指发放红包时，一次只有一个用户的形式。
发放普通红包的接口如下。
https:// api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack
发放普通红包时，POST数据示例如下。
<xml>
<sign><![CDATA[E1EE61A91C8E90F299DE6AE075D60A2D]]></sign>
<mch_billno><![CDATA[0010010404201411170000046545]]></mch_billno>
<mch_id><![CDATA[888]]></mch_id>
<wxappid><![CDATA[wxcbda96de0b165486]]></wxappid>
<send_name><![CDATA[send_name]]></send_name>
<re_openid><![CDATA[onqOjjmM1tad-3ROpncN-yUfa6uI]]></re_openid>
<total_amount><![CDATA[200]]></total_amount>
<total_num><![CDATA[1]]></total_num>
<wishing><![CDATA[恭喜发财]]></wishing>
<client_ip><![CDATA[127.0.0.1]]></client_ip>
<act_name><![CDATA[新年红包]]></act_name>
<remark><![CDATA[新年红包]]></remark>
<scene_id><![CDATA[PRODUCT_2]]></scene_id>
<consume_mch_id><![CDATA[10000097]]></consume_mch_id>
<nonce_str><![CDATA[50780e0cca98c8c8e814883e5caa672e]]></nonce_str>
<risk_info>posttime%3d123123412%26clientversion%3d234134%26mobile%3d122344545%26
deviceid%3dIOS</risk_info>
</xml>
同时，发送普通红包时需要带上文件证书，提高安全级别。
上述数据的参数说明如表17-6所示。
表17-6 发放普通红包接口的参数说明
正确创建时，返回的数据示例如下。
<xml>
<return_code><![CDATA[SUCCESS]]></return_code>
<return_msg><![CDATA[发放成功.]]></return_msg>
<result_code><![CDATA[SUCCESS]]></result_code>
<err_code><![CDATA[0]]></err_code>
<err_code_des><![CDATA[发放成功.]]></err_code_des>
<mch_billno><![CDATA[0010010404201411170000046545]]></mch_billno>
<mch_id>10010404</mch_id>
<wxappid><![CDATA[wx6fa7e3bab7e15415]]></wxappid>
<re_openid><![CDATA[onqOjjmM1tad-3ROpncN-yUfa6uI]]></re_openid>
<total_amount>1</total_amount>
</xml>
上述数据的参数说明如表17-7所示。
表17-7 发放普通红包接口返回参数说明
微信红包接口类的实现代码如下。
1 class WxPay
2 {
3 var $appid = APPID;
4 var $appsecret = APPSECRET;
5
6 // 构造函数，获取Access Token
7 public function __construct($appid = NULL, $appsecret = NULL)
8 {
9 if($appid && $appsecret){
10 $this->appid = $appid;
11 $this->appsecret = $appsecret;
12
13 // 3. 本地写入
14 $res = file_get_contents('access_token.json');
15 $result = json_decode($res, true);
16 $this->expires_time = $result["expires_time"];
17 $this->access_token = $result["access_token"];
18 if (time > ($this->expires_time + 3600)){
19 $url = "https:// api.weixin.qq.com/cgi-bin/token?grant_type=client_
credential&appid=".$this->appid."&secret=".$this->appsecret;
20 var_dump($url);
21 $res = $this->http_request($url, null, false);
22 $result = json_decode($res, true);
23 $this->access_token = $result["access_token"];
24 $this->expires_time = time;
25 file_put_contents('access_token.json', '{"access_token": "'.$this-
>access_token.'", "expires_time": '.$this->expires_time.'}');
26 }
27 }
28 }
29
30 // 发起支付请求
31 function wxpay($url, $obj, $cert = false)
32 {
33 $obj['nonce_str'] = $this->create_noncestr;
34 $stringA = $this->formatQueryParaMap($obj, false);
35 $stringSignTemp = $stringA . "&key=" . PARTNERKEY;
36 $sign = strtoupper(md5($stringSignTemp));
37 $obj['sign'] = $sign;
38 $postXml = $this->arrayToXml($obj);
39 $responseXml = $this->http_request($url, $postXml, $cert);
40 return $responseXml;
41 }
42
43 // 随机字符串
44 function create_noncestr($length = 32)
45 {
46 $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
47 $str = "";
48 for ( $i = 0; $i < $length; $i++ ) {
49 $str.= substr($chars, mt_rand(0, strlen($chars)-1), 1);
50 }
51 return $str;
52 }
53
54 // 格式化字符串
55 function formatQueryParaMap($paraMap, $urlencode)
56 {
57 $buff = "";
58 ksort($paraMap);
59 foreach ($paraMap as $k => $v){
60 if (null != $v && "null" != $v && "sign" != $k) {
61 if($urlencode){
62 $v = urlencode($v);
63 }
64 $buff .= $k . "=" . $v . "&";
65 }
66 }
67 $reqPar;
68 if (strlen($buff) > 0) {
69 $reqPar = substr($buff, 0, strlen($buff)-1);
70 }
71 return $reqPar;
72 }
73
74 // 数组转XML
75 function arrayToXml($arr)
76 {
77 $xml = "<xml>";
78 foreach ($arr as $key=>$val)
79 {
80 if (is_numeric($val)){
81 $xml.="<".$key.">".$val."</".$key.">";
82 }else{
83 $xml.="<".$key."><![CDATA[".$val."]]></".$key.">";
84 }
85 }
86 $xml.="</xml>";
87 return $xml;
88 }
89
90 // 将XML转为array
91 function xmlToArray($xml)
92 {
93 // 禁止引用外部XML实体
94 libxml_disable_entity_loader(true);
95 $values = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement',
LIBXML_NOCDATA)), true);
96 return $values;
97 }
98
99 // 带证书的POST请求
100 function http_request($url, $fields = null, $cert = true)
101 {
102 $ch = curl_init;
103 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
104 curl_setopt($ch, CURLOPT_URL, $url);
105 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER,false);
106 curl_setopt($ch, CURLOPT_SSL_VERIFYHOST,false);
107 curl_setopt($ch, CURLOPT_SSLCERT, 'cert'.DIRECTORY_SEPARATOR.'apiclient_
cert.pem');
108 curl_setopt($ch, CURLOPT_SSLKEY, 'cert'.DIRECTORY_SEPARATOR.'apiclient_
key.pem');
109 curl_setopt($ch, CURLOPT_CAINFO, 'cert'.DIRECTORY_SEPARATOR.'rootca.pem');
110 if (!empty($fields)){
111 curl_setopt($ch, CURLOPT_POST, 1);
112 curl_setopt($ch, CURLOPT_POSTFIELDS, $fields);
113 }
114 $data = curl_exec($ch);
115 if(!$data){echo "CURL ErrorCode: ".curl_errno($ch);}
116 curl_close($ch);
117 return $data;
118 }
119 }
调用微信红包的方法如下。
1 $money = 101;
2 $sender = "方倍工作室";
3 $obj = array;
4 $obj['wxappid'] = APPID;
5 $obj['mch_id'] = MCHID;
6 $obj['mch_billno'] = MCHID.date('YmdHis').rand(1000, 9999);
7 $obj['client_ip'] = $_SERVER['REMOTE_ADDR'];
8 $obj['re_openid'] = $openid;
9 $obj['total_amount'] = $money;
10 $obj['total_num'] = 1;
11 $obj['nick_name'] = $sender;
12 $obj['send_name'] = $sender;
13 $obj['wishing'] = "恭喜发财";
14 $obj['act_name'] = "猜灯谜抢红包";
15 $obj['remark'] = "猜越多得越多";
16 var_dump($obj);
17 $url = 'https:// api.mch.weixin.qq.com/mmpaymkttransfers/sendredpack';
18 $wxHongBaoHelper = new WxPay;
19 $data = $wxHongBaoHelper->wxpay($url, $obj, true);
20 $res = $wxHongBaoHelper->xmlToArray($data);
21 var_dump($res);
执行上述代码后，用户将收到红包，效果如图17-9所示。
图17-9 微信支付普通红包