Php - Blacklist IPs - Simple way to blacklist IP's, good for instance when you want to stop certain IP ranges known to be spammers.

?php function IP_Blacklist($minimum = null, $maximum = null) {     $ip = ip2long($_SERVER['REMOTE_ADDR']);     if (is_null($minimum) === false)     {         $minimum = explode('.', $minimum);         foreach ($minimum as $key => $value)         {             $minimum[$key] = ($value == '*') ? 0 : $value;         }         $minimum = ip2long(implode('.', $minimum));         if ($ip >= $minimum)         {             return false;         }     }     if (is_null($maximum) === false)     {         $maximum = explode('.', $maximum);         foreach ($maximum as $key => $value)         {             $maximum[$key] = ($value == '*') ? 255 : $value;         }         $maximum = ip2long(implode('.', $maximum));         if ($ip <= $maximum)         {             return false;         }     }     return true; } ?>

Usage $_SERVER['REMOTE_ADDR'] = 195.22.23.24:

<?php IP_Blacklist('195.22.23.*'); // false, blacklisted IP_Blacklist('195.0.0.0', '195.255.255.255'); // false, blacklisted IP_Blacklist('195.22.23.25', '195.22.23.255'); // true, clean if (IP_Blacklist('195.22.23.*', '195.22.23.*') === false) {     die('Nice try spammer.'); } ?>