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