Requests_IPv6::compress() public WP 1.0
Compresses an IPv6 address
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
{} It's a method of the class: Requests_IPv6{}
No Hooks.
Return
String. The compressed IPv6 address
Usage
$result = Requests_IPv6::compress( $ip );
- $ip(string) (required)
- An IPv6 address
Notes
- See: uncompress()
Code of Requests_IPv6::compress() Requests IPv6::compress WP 5.6
public static function compress($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];
}
}