Requests_IPv6::uncompress

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Summery Summery

Uncompresses an IPv6 address

Syntax Syntax

Requests_IPv6::uncompress( string $ip )

Description 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 Parameters

$ip

(string) (Required) An IPv6 address

Return Return

(string) The uncompressed IPv6 address

Source Source

File: wp-includes/Requests/IPv6.php

	public static function uncompress($ip) {
		if (substr_count($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) {
			$ip = '0:0:0:0:0:0:0:0';
		}
		// ::xxx
		else if ($c1 === -1) {
			$fill = str_repeat('0:', 7 - $c2);
			$ip = str_replace('::', $fill, $ip);
		}
		// xxx::
		else if ($c2 === -1) {
			$fill = str_repeat(':0', 7 - $c1);
			$ip = str_replace('::', $fill, $ip);
		}
		// xxx::xxx
		else {
			$fill = ':' . str_repeat('0:', 6 - $c2 - $c1);
			$ip = str_replace('::', $fill, $ip);
		}
		return $ip;
	}

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