SimplePie_Net_IPv6::uncompress

Advertisement

Summery Summery

Uncompresses an IPv6 address

Syntax Syntax

SimplePie_Net_IPv6::uncompress( string $ip )

Description Description

RFC 4291 allows you to compress concecutive 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/SimplePie/Net/IPv6.php

	{
		$c1 = -1;
		$c2 = -1;
		if (substr_count($ip, '::') === 1)
		{
			list($ip1, $ip2) = explode('::', $ip);
			if ($ip1 === '')
			{
				$c1 = -1;
			}
			else
			{
				$c1 = substr_count($ip1, ':');
			}
			if ($ip2 === '')
			{
				$c2 = -1;
			}
			else
			{
				$c2 = substr_count($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;
	}

Advertisement

Advertisement

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.