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Uncompresses an IPv6 address
Syntax Syntax
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
- $ip
-
(Required) An IPv6 address
Return Return
(string) The uncompressed IPv6 address
Source Source
File: wp-includes/Requests/IPv6.php
public static function uncompress($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;
}