Ipv6::uncompress( string|WpOrgRequestsStringable $ip )

Uncompresses an IPv6 address


Description

RFC 4291 allows you to compress consecutive zero pieces in an address to ‘::’. This method expects a valid IPv6 address and expands the ‘::’ to the required number of zero pieces.

Example: FF01::101 -> FF01:0:0:0:0:0:0:101 ::1 -> 0:0:0:0:0:0:0:1


Parameters

$ip

(Required) An IPv6 address


Return

(string) The uncompressed IPv6 address


Source

File: wp-includes/Requests/src/Ipv6.php

	public static function uncompress($ip) {
		if (InputValidator::is_string_or_stringable($ip) === false) {
			throw InvalidArgument::create(1, '$ip', 'string|Stringable', gettype($ip));
		}

		$ip = (string) $ip;

		if (substr_count($ip, '::') !== 1) {
			return $ip;
		}

		list($ip1, $ip2) = explode('::', $ip);
		$c1              = ($ip1 === '') ? -1 : substr_count($ip1, ':');
		$c2              = ($ip2 === '') ? -1 : substr_count($ip2, ':');

		if (strpos($ip2, '.') !== false) {
			$c2++;
		}

		if ($c1 === -1 && $c2 === -1) {
			// ::
			$ip = '0:0:0:0:0:0:0:0';
		} elseif ($c1 === -1) {
			// ::xxx
			$fill = str_repeat('0:', 7 - $c2);
			$ip   = str_replace('::', $fill, $ip);
		} elseif ($c2 === -1) {
			// xxx::
			$fill = str_repeat(':0', 7 - $c1);
			$ip   = str_replace('::', $fill, $ip);
		} else {
			// xxx::xxx
			$fill = ':' . str_repeat('0:', 6 - $c2 - $c1);
			$ip   = str_replace('::', $fill, $ip);
		}

		return $ip;
	}