wanting to get host name instead of ip

hello, I was wondering, is there a way to get a connection's name(host's name instead of just ip), i am using the cli version of php and am now using the function getpeername() but for example, i would like to be able to have it say something like "connection: localhost ...." instead of "connection: 127.0.0.1" is this possible with the command line interface? I am using php 4.3.10 on linux matt