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# Net_IPv6::compress()

Net_IPv6::compress() -- compress an IPv6 address

## Synopsis

    require_once 'Net/IPv6.php';

``string Net_IPv6::compress` (string $ip)`

## Description

Compresses an IPv6 address. RFC 2373 allows you to compress zeros in an address to '::'. This function expects an valid IPv6 address and compresses successive zeros to '::'

    FF01:0:0:0:0:0:0:101 -> FF01::101
          0:0:0:0:0:0:0:1      -> ::1

## Parameter

- `string $ip` - the IP address to compress

## Return value

`string` - the compressed IP is an IPv6 address

## Note

This function can be called statically.

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Net_IPv6::checkIPv6() | Up | Net_IPv6::uncompress()