在本项目中，微信API接口也是作为一个第三方类库存在的，其目录为extend/weixin/Wxapi.php。其实现代码如下。
1 <?php 2 3 /* 4 方倍工作室 http:// www.fangbei.org/ 5 CopyRight 2014 All Rights Reserved 6 */ 7 namespace weixin; 8 require_once('config.php'); 9 10 class Wxapi 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 // 3. 本地写入 23 $res = file_get_contents('access_token.json'); 24 $result = json_decode($res, true); 25 $this->expires_time = $result["expires_time"]; 26 $this->access_token = $result["access_token"]; 27 28 if (time > ($this->expires_time + 3600)){ 29 $url = "https:// api.weixin.qq.com/cgi-bin/token?grant_type=client_ credential&appid=".$this->appid."&secret=".$this->appsecret; 30 $res = $this->http_request($url); 31 $result = json_decode($res, true); 32 $this->access_token = $result["access_token"]; 33 $this->expires_time = time; 34 file_put_contents('access_token.json', '{"access_token": "'.$this-> access_token.'", "expires_time": '.$this->expires_time.'}'); 35 } 36 } 37 38 // 获取用户信息 39 public function get_user_info($openid) 40 { 41 $url = "https:// api.weixin.qq.com/cgi-bin/user/info?access_token=".$this-> access_token."&openid=".$openid."&lang=zh_CN"; 42 $res = $this->http_request($url); 43 return json_decode($res, true); 44 } 45 46 // 获取用户列表 47 public function get_user_list($next_openid = NULL) 48 { 49 $url = "https:// api.weixin.qq.com/cgi-bin/user/get?access_token=".$this-> access_token."&next_openid=".$next_openid; 50 $res = $this->http_request($url); 51 $list = json_decode($res, true); 52 if ($list["count"] == 10000){ 53 $new = $this->get_user_list($next_openid = $list["next_openid"]); 54 $list["data"]["openid"] = array_merge_recursive($list["data"]["openid"], $new["data"]["openid"]); // 合并OpenID列表 55 } 56 return $list; 57 } 58 59 // 发送客服消息 60 public function send_custom_message($touser, $type, $data) 61 { 62 $msg = array('touser' =>$touser); 63 $msg['msgtype'] = $type; 64 switch($type) 65 { 66 case 'text': 67 $msg[$type] = array('content'=>urlencode($data)); 68 break; 69 case 'news': 70 $data2 = array; 71 foreach ($data as &$item) { 72 $item2 = array; 73 foreach ($item as $k => $v) { 74 $item2[strtolower($k)] = urlencode($v); 75 } 76 $data2 = $item2; 77 } 78 $msg[$type] = array('articles'=>$data2); 79 break; 80 case 'music': 81 case 'image': 82 case 'voice': 83 case 'video': 84 $msg[$type] = $data; 85 break; 86 default: 87 $msg['text'] = array('content'=>urlencode("不支持的消息类型 ".$type)); 88 break; 89 } 90 $url = "https:// api.weixin.qq.com/cgi-bin/message/custom/send?access_ token=".$this->access_token; 91 return $this->http_request($url, urldecode(json_encode($msg))); 92 } 93 94 // HTTP请求（支持HTTP/HTTPS，支持GET/POST） 95 protected function http_request($url, $data = null) 96 { 97 $curl = curl_init; 98 curl_setopt($curl, CURLOPT_URL, $url); 99 curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);100 curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);101 if (!empty($data)){102 curl_setopt($curl, CURLOPT_POST, 1);103 curl_setopt($curl, CURLOPT_POSTFIELDS, $data);104 }105 curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);106 $output = curl_exec($curl);107 curl_close($curl);108 return $output;109 }110 } 上述接口方法中，实现了微信Access Token的获取、存储及自动更新，获取用户列表及获取用户基本信息两个用户管理接口，以及客服消息的发送接口。