note 55230 added to ref.network

Regarding samuele's note: You can get faster code if you apply directly what happens in network devices, such as routers. If you AND (logic operation) the remote ip against the local netmask the result will be the network ip if the remote ip is from the local network. Example: 192.168.0.16 = 11000000.10101000.00000000.00010000 & 255.255.255.0 = 11111111.11111111.11111111.00000000 -------------------------------------------------------------- 192.168.0.0 = 11000000.10101000.00000000.00000000 And now the code. My example uses a html form where you place the values you want to test: <HTML><HEAD><TITLE>Check IP</TITLE> </HEAD><BODY> <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST"> Hope you find this useful. IP to check: <input type="text" name="ip"> <br> Local network ip: <input type="text" name="net"> <br> Local netmask: <input type="text" name="mask"> <br> <input type="submit" name="check" value="Check it!"> </form> <?php /** * @param string $ip IP to check in dotted decimal format * @param string $net Network IP in dotted decimal format * @param string $mask Netmask in dotted decimal format * @returns true if the ip belongs to the network, false otherwise **/ function isIPIn($ip, $net, $mask) { //doesn't check for the return value of ip2long $ip = ip2long($_POST['ip']); $rede = ip2long($_POST['net']); $mask = ip2long($_POST['mask']); //AND $res = $ip & $mask; return ($res == $rede); } if (isset($_POST['check'])) { echo isIPIn($_POST['ip'], $_POST['net'], $_POST['mask']) ? "IP IN.": "IP OUT."; } ?> </BODY><HTML> ---- Manual Page -- http://www.php.net/manual/en/ref.network.php Edit -- http://master.php.net/manage/user-notes.php?action=edit+55230 Delete: added to the manual -- http://master.php.net/manage/user-notes.php?action=delete+55230&report=yes&reason=added+to+the+manual Delete: bad code -- http://master.php.net/manage/user-notes.php?action=delete+55230&report=yes&reason=bad+code Delete: spam -- http://master.php.net/manage/user-notes.php?action=delete+55230&report=yes&reason=spam Delete: useless -- http://master.php.net/manage/user-notes.php?action=delete+55230&report=yes&reason=useless Delete: non-english -- http://master.php.net/manage/user-notes.php?action=delete+55230&report=yes&reason=non-english Delete: other reasons -- http://master.php.net/manage/user-notes.php?action=delete+55230&report=yes Reject -- http://master.php.net/manage/user-notes.php?action=reject+55230&report=yes Search -- http://master.php.net/manage/user-notes.php