function cidr_match($ip, $range)
{
list ($subnet, $bits) = explode('/', $range);
if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
if (!filter_var($subnet, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
return false;
}
$ip = inet_pton($ip);
$subnet = inet_pton($subnet);
for ($i = 0; $bits > 0 && $i < 16; $i++) {
$v = substr($ip, $i, 1);
$s = substr($subnet, $i, 1);
if ($bits < 8) {
$v = substr(str_pad(decbin(ord($v)), 8, '0', STR_PAD_LEFT), 0, $bits);
$s = substr(str_pad(decbin(ord($s)), 8, '0', STR_PAD_LEFT), 0, $bits);
}
if ($v !== $s) {
return false;
}
$bits -= 8;
}
return true;
} else {
if (!filter_var($subnet, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
return false;
}
$ip = ip2long($ip);
$subnet = ip2long($subnet);
$mask = -1 << (32 - $bits);
$subnet &= $mask;
return ($ip & $mask) == $subnet;
}
}
支持 IPv4 和 IPv6 子网掩码判断，IPv6 代码参考自 Matching IPv6 address to a CIDR subnet
