string Net_IPv6::compress (
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
string $ip - the IP address to compress
string - the compressed IP is an IPv6 address
This function can be called statically.