Файл: vendor/geoip2/geoip2/src/Util.php
Строк: 36
<?php
declare(strict_types=1);
namespace GeoIp2;
class Util
{
/**
* This returns the network in CIDR notation for the given IP and prefix
* length. This is for internal use only.
*
* @internal
* @ignore
*/
public static function cidr(string $ipAddress, int $prefixLen): string
{
$ipBytes = inet_pton($ipAddress);
$networkBytes = str_repeat(" ", strlen($ipBytes));
$curPrefix = $prefixLen;
for ($i = 0; $i < strlen($ipBytes) && $curPrefix > 0; $i++) {
$b = $ipBytes[$i];
if ($curPrefix < 8) {
$shiftN = 8 - $curPrefix;
$b = chr(0xFF & (ord($b) >> $shiftN) << $shiftN);
}
$networkBytes[$i] = $b;
$curPrefix -= 8;
}
$network = inet_ntop($networkBytes);
return "$network/$prefixLen";
}
}