根据上述接口的介绍及定义，将微信卡券的PHP SDK实现如下。
1 <?php
2
3 /*
4 方倍工作室 http:// www.fangbei.org/
5 CopyRight 2014 All Rights Reserved
6 */
7 define('APPID', "wx1b7559b818e3c23e");
8 define('APPSECRET', "wx1b7559b818e3c23ewx1b7559b818e3c23e");
9
10 class class_weixin
11 {
12 var $appid = APPID;
13 var $appsecret = APPSECRET;
14
15 // 构造函数，获取Access Token
16 public function __construct($appid = NULL, $appsecret = NULL)
17 {
18 if($appid && $appsecret){
19 $this->appid = $appid;
20 $this->appsecret = $appsecret;
21 }
22 $res = file_get_contents('access_token.json');
23 $result = json_decode($res, true);
24 $this->expires_time = $result["expires_time"];
25 $this->access_token = $result["access_token"];
26
27 if (time > ($this->expires_time + 3600)){
28 $url = "https:// api.weixin.qq.com/cgi-bin/token?grant_type=client_
credential&appid=".$this->appid."&secret=".$this->appsecret;
29 $res = $this->http_request($url);
30 $result = json_decode($res, true);
31 $this->access_token = $result["access_token"];
32 $this->expires_time = time;
33 file_put_contents('access_token.json', '{"access_token": "'.$this->ac
cess_token.'", "expires_time": '.$this->expires_time.'}');
34 }
35 }
36
37 // 生成长度为16的随机字符串
38 public function createNonceStr($length = 16) {
39 $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
40 $str = "";
41 for ($i = 0; $i < $length; $i++) {
42 $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
43 }
44 return $str;
45 }
46
47 // 获得微信卡券api_ticket
48 public function getCardApiTicket
49 {
50 $res = file_get_contents('cardapi_ticket.json');
51 $result = json_decode($res, true);
52 $this->cardapi_ticket = $result["cardapi_ticket"];
53 $this->cardapi_expire = $result["cardapi_expire"];
54 if (time > ($this->cardapi_expire + 3600)){
55 $url = "https:// api.weixin.qq.com/cgi-bin/ticket/getticket?type=wx_
card&access_token=".$this->access_token;
56 $res = $this->http_request($url);
57 $result = json_decode($res, true);
58 $this->cardapi_ticket = $result["ticket"];
59 $this->cardapi_expire = time;
60 file_put_contents('cardapi_ticket.json', '{"cardapi_ticket": "'.$this->
cardapi_ticket.'", "cardapi_expire": '.$this->cardapi_expire.'}');
61 }
62 return $this->cardapi_ticket;
63 }
64
65 // cardSign卡券签名
66 public function get_cardsign($bizObj)
67 {
68 // 字典序排序
69 asort($bizObj);
70 // URL键值对拼成字符串
71 $buff = "";
72 foreach ($bizObj as $k => $v){
73 $buff .= $v;
74 }
75 // sha1签名
76 return sha1($buff);
77 }
78
79 // 获得JS API的Ticket
80 private function getJsApiTicket
81 {
82 $res = file_get_contents('jsapi_ticket.json');
83 $result = json_decode($res, true);
84 $this->jsapi_ticket = $result["jsapi_ticket"];
85 $this->jsapi_expire = $result["jsapi_expire"];
86
87 if (time > ($this->jsapi_expire + 3600)){
88 $url = "https:// api.weixin.qq.com/cgi-bin/ticket/getticket?type=js
api&access_token=".$this->access_token;
89 $res = $this->http_request($url);
90 $result = json_decode($res, true);
91 $this->jsapi_ticket = $result["ticket"];
92 $this->jsapi_expire = time;
93 file_put_contents('jsapi_ticket.json', '{"jsapi_ticket": "'.$this->
jsapi_ticket.'", "jsapi_expire": '.$this->jsapi_expire.'}');
94 }
95 return $this->jsapi_ticket;
96 }
97
98 // 获得签名包
99 public function getSignPackage {
100 $jsapiTicket = $this->getJsApiTicket;
101 $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off'
|| $_SERVER['SERVER_PORT'] == 443) ? "https:// " : "http:// ";
102 $url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
103 $timestamp = time;
104 $nonceStr = $this->createNonceStr;
105 $string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr×tamp=$ti
mestamp&url=$url";
106 $signature = sha1($string);
107 $signPackage = array(
108 "appId" => $this->appid,
109 "nonceStr" => $nonceStr,
110 "timestamp" => $timestamp,
111 "url" => $url,
112 "signature" => $signature,
113 "rawString" => $string
114 );
115 return $signPackage;
116 }
117
118 // HTTP请求（支持HTTP/HTTPS，支持GET/POST）
119 protected function http_request($url, $data = null)
120 {
121 $curl = curl_init;
122 curl_setopt($curl, CURLOPT_URL, $url);
123 curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
124 curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);
125 if (!empty($data)){
126 curl_setopt($curl, CURLOPT_POST, 1);
127 curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
128 }
129 curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);
130 $output = curl_exec($curl);
131 curl_close($curl);
132 return $output;
133 }
134 }
上述代码简要解读如下。
第7～8行：定义开发者参数。
第15～35行：定义构造函数，在构造函数中同时初始化获得Access Token。
第37～45行：用于生成默认长度为16的随机字符串。
第47～63行：获得微信卡券api_ticket，并使用文件进行缓存。
第65～77行：定义cardSign卡券签名函数。
第79～96行：获得JS API的Ticket，并使用文件进行缓存。
第98～116行：获得JS-SDK的签名。
第118～133行：定义HTTP请求函数。
上述SDK包括JS API的Ticket的获取，也包括卡券API的Ticket的获取。