function get_accessToken(){
$appid = ‘......‘;
$secret = ‘......‘;
$tokenFile = "./access_token.txt"; // 缓存文件名
$data = json_decode(file_get_contents($tokenFile)); //转换为json格式
if ($data->expire_time < time() or ! $data->expire_time) {
//token过期的情况
$res = file_get_contents(‘https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=‘ . $appid . ‘&secret=‘ . $secret);
$res = json_decode($res, true); // 对 JSON 格式的字符串进行编码
$access_token = $res[‘access_token‘];
if ($access_token) {
$data->expire_time = time() + 7200; //保存2小时
$data->access_token = $access_token;
$fp = fopen($tokenFile, "w"); //只写文件
fwrite($fp, json_encode($data)); //写入json格式文件
fclose($fp); //关闭连接
}
} else {
$access_token = $data->access_token;
}
return $access_token;
}