Ipv6::check_ipv6( string $ip ): bool

Source

public static function check_ipv6($ip) {
	// Note: Input validation is handled in the `uncompress()` method, which is the first call made in this method.
	$ip                = self::uncompress($ip);
	list($ipv6, $ipv4) = self::split_v6_v4($ip);
	$ipv6              = explode(':', $ipv6);
	$ipv4              = explode('.', $ipv4);
	if (count($ipv6) === 8 && count($ipv4) === 1 || count($ipv6) === 6 && count($ipv4) === 4) {
		foreach ($ipv6 as $ipv6_part) {
			// The section can't be empty
			if ($ipv6_part === '') {
				return false;
			}

			// Nor can it be over four characters
			if (strlen($ipv6_part) > 4) {
				return false;
			}

			// Remove leading zeros (this is safe because of the above)
			$ipv6_part = ltrim($ipv6_part, '0');
			if ($ipv6_part === '') {
				$ipv6_part = '0';
			}

			// Check the value is valid
			$value = hexdec($ipv6_part);
			if (dechex($value) !== strtolower($ipv6_part) || $value < 0 || $value > 0xFFFF) {
				return false;
			}
		}

		if (count($ipv4) === 4) {
			foreach ($ipv4 as $ipv4_part) {
				$value = (int) $ipv4_part;
				if ((string) $value !== $ipv4_part || $value < 0 || $value > 0xFF) {
					return false;
				}
			}
		}

		return true;
	} else {
		return false;
	}
}

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