cut domain name

[alirezaok]

i have a variable.
it has an url.
exmaple:
$variable="http://www.phpbuilder.com/board/newthread.php?do=newthread&f=10";
or
$variable="http://www.phpbuilder.com/";

i want to cut the server_name (domain) of this variable as result
in this exmaple result must: www.phpbuilder.com

any one can help me?

[laserlight]

Consider using [man]parse_url/man.