PFinal\Wechat\Support\Curl::get PHP Method

    public static function get($url)
    {
        return self::execute($url, 'get');
    }

 /**
  * 获取公众号的全局唯一票据accessToken，公众号主动调用各接口时都需使用accessToken
  * accessToken默认有效时间为7200秒，每天调用次数有限制，认证服务号每天最多100000次
  *
  * @param bool $useCache 是否使用缓存
  * @return string|null
  */
 public function getAccessToken($useCache = true)
 {
     //缓存key
     $cacheKey = md5(__FILE__ . __METHOD__ . $this->appId);
     //检查是否启用缓存
     if ($useCache) {
         if (empty($this->accessToken)) {
             $this->accessToken = Cache::get($cacheKey);
         }
         if (!empty($this->accessToken)) {
             return $this->accessToken;
         }
     } else {
         $this->accessToken = null;
         Cache::delete($cacheKey);
     }
     //获取accessToken
     $url = 'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=%s&secret=%s';
     $response = Curl::get(sprintf($url, $this->appId, $this->appSecret));
     //返回格式 {"access_token":"ACCESS_TOKEN","expires_in":7200}
     //{"access_token":"43BKbLBjBnwH600H5TMSlx6AKT9TCZ3BRXjxvT0erRpzHTIaUuaJBDUoUykTqA","expires_in":7200}
     //每日调用超过次数，将提示
     //{"errcode":45009,"errmsg":"reach max api daily quota limit hint: [PuguNA0618vr22]"}
     $arr = Json::parseOrFail($response);
     $this->accessToken = $arr['access_token'];
     //默认时间是7200秒(120分钟)
     $expires = $arr['expires_in'] - 1200;
     if ($expires > 0) {
         Cache::set($cacheKey, $this->accessToken, $expires);
     }
     return $this->accessToken;
 }