Summery Summery
Compresses 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 compresses consecutive zero pieces to ‘::’.
Example: FF01:0:0:0:0:0:0:101 -> FF01::101 0:0:0:0:0:0:0:1 -> ::1
Parameters Parameters
- $ip
-
(Required) An IPv6 address
Return Return
(string) The compressed IPv6 address
Source Source
File: wp-includes/Requests/IPv6.php
public static function compress($ip) { // Prepare the IP to be compressed $ip = self::uncompress($ip); $ip_parts = self::split_v6_v4($ip); // Replace all leading zeros $ip_parts[0] = preg_replace('/(^|:)0+([0-9])/', '\1\2', $ip_parts[0]); // Find bunches of zeros if (preg_match_all('/(?:^|:)(?:0(?::|$))+/', $ip_parts[0], $matches, PREG_OFFSET_CAPTURE)) { $max = 0; $pos = null; foreach ($matches[0] as $match) { if (strlen($match[0]) > $max) { $max = strlen($match[0]); $pos = $match[1]; } } $ip_parts[0] = substr_replace($ip_parts[0], '::', $pos, $max); } if ($ip_parts[1] !== '') { return implode(':', $ip_parts); } else { return $ip_parts[0]; } }