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<?php
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namespace LaneWeChat\Core;
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/**
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* 微信Access_Token的获取与过期检查
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* Created by Lane.
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* User: lane
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* Date: 13-12-29
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* Time: 下午5:54
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* Mail: lixuan868686@163.com
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* Website: http://www.lanecn.com
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*/
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class AccessToken{
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/**
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* 获取微信Access_Token
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*/
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public static function getAccessToken(){
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//检测本地是否已经拥有access_token，并且检测access_token是否过期
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$accessToken = self::_checkAccessToken();
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if($accessToken === false){
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$accessToken = self::_getAccessToken();
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}
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return $accessToken['access_token'];
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}
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/**
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* @descrpition 从微信服务器获取微信ACCESS_TOKEN
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* @return Ambigous|bool
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*/
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private static function _getAccessToken(){
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$url = 'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid='.WECHAT_APPID.'&secret='.WECHAT_APPSECRET;
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$accessToken = Curl::callWebServer($url, '', 'GET');
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if(!isset($accessToken['access_token'])){
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return Msg::returnErrMsg(MsgConstant::ERROR_GET_ACCESS_TOKEN, '获取ACCESS_TOKEN失败');
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}
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$accessToken['time'] = time();
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$accessTokenJson = json_encode($accessToken);
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//存入数据库
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/**
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* 这里通常我会把access_token存起来，然后用的时候读取，判断是否过期，如果过期就重新调用此方法获取，存取操作请自行完成
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*
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* 请将变量$accessTokenJson给存起来，这个变量是一个字符串
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*/
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$f = fopen('access_token', 'w+');
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fwrite($f, $accessTokenJson);
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fclose($f);
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return $accessToken;
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}
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/**
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* @descrpition 检测微信ACCESS_TOKEN是否过期
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* -10是预留的网络延迟时间
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* @return bool
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*/
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private static function _checkAccessToken(){
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//获取access_token。是上面的获取方法获取到后存起来的。
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// $accessToken = YourDatabase::get('access_token');
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$data = file_get_contents('access_token');
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$accessToken['value'] = $data;
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if(!empty($accessToken['value'])){
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$accessToken = json_decode($accessToken['value'], true);
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if(time() - $accessToken['time'] < $accessToken['expires_in']-10){
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return $accessToken;
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}
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}
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return false;
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}
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}
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?>
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