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Editing: CidrCheck.php
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<?php namespace LLAR\Lib; class CidrCheck { public function match($ip, $cidr) { if (!filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) { return false; } $c = explode('/', $cidr); $subnet = isset($c[0]) ? $c[0] : NULL; $mask = isset($c[1]) ? $c[1] : NULL; if ($mask === null) { $mask = 32; } return $this->IPv4Match($ip, $subnet, $mask); } private function IPv4Match($address, $subnetAddress, $subnetMask) { if (!filter_var($subnetAddress, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) || $subnetMask === NULL || $subnetMask === "" || $subnetMask < 0 || $subnetMask > 32) { return false; } $address = ip2long($address); $subnetAddress = ip2long($subnetAddress); $mask = -1 << (32 - $subnetMask); $subnetAddress &= $mask; # nb: in case the supplied subnet wasn't correctly aligned return ($address & $mask) == $subnetAddress; } }