if (isset($_REQUEST["network"])) { print "value=\"" . $_REQUEST["network"] . "\""; } ?> type="text"> </div> <div class="form-group"> <button type="submit" class="btn btn-default">Get</button> </div> </fieldset> </form> <?php if (isset($_REQUEST["network"])) { if ($_REQUEST["network"] != '') { // initialize object $ipv4 = new Net_IPv4(); $net = preg_split("/[\\/]/", $_REQUEST["network"]); // validate IP address //echo $ipv4->validateIp($net[0]) ? "IP is valid" : "IP is invalid"; if ($ipv4->validateIp($net[0]) && ($net[1] > 0 && $net[1] < 33)) { include "show.php"; } else { render("apology.php", ["message" => "The provided CIDR is invalid."]); } } } ?> </table>