微信 getAccessToken方法详解及实例

<?phpfunction getAccessToken($appid,$appsecret) {  $mem = new CacheMemcache();  $acc = $mem->get('access_token_'.$appid);  if (!$acc)   {    $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$appid&secret=$appsecret";    $result = https_request($url);    $jsoninfo = json_decode($result, true);    $access_token = $jsoninfo['access_token'];    if ($access_token)     {      $expire = time() + 7000;      $mem = new CacheMemcache();      $mem->set('access_token_'.$appid,$access_token,$expire);    }  }  else   {    $access_token = $acc;  }  return $access_token;}?>

 function getAccessToken() {  // access_token 应该全局存储与更新，以下代码以写入到文件中做示例  $data = json_decode(file_get_contents("access_token.json"));  if ($data->expire_time < time()) {   $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";   $res = json_decode($this->httpGet($url));   $access_token = $res->access_token;   if ($access_token) {    $data->expire_time = time() + 7000;    $data->access_token = $access_token;    $fp = fopen("access_token.json", "w");    fwrite($fp, json_encode($data));    fclose($fp);   }  } else {   $access_token = $data->access_token;  }  return $access_token; }