/**
  * isThirdforceIp()
  *
  * #test isThirdforceIp1
  * <code>
  * #true(sfMobileCarrierJP::isThirdforceIp("210.146.60.240"));
  * </code>
  * #test isThirdforceIp2
  * <code>
  * #false(sfMobileCarrierJP::isThirdforceIp("211.5.2.128"));
  * #false(sfMobileCarrierJP::isThirdforceIp("210.136.161.255"));
  * </code>
  */
 public static function isThirdforceIp($ip)
 {
     $i = ip2long($ip);
     $cidrs = sfMobileCarrierJP::getThirdforceCidr();
     foreach ($cidrs as $cidr) {
         if (sfMobileCarrierJP::inCidr($ip, $cidr["ip"], $cidr["subnetmask"])) {
             return true;
         }
     }
     return false;
 }