need help parsing a url

[abda53]

i am having trouble trying to find out how i can parse this.

https://sso.sprintpcs.com/sso/registerForAccountPhoneNumberAction.do

all of the urls i have in log need to be parsed, and they all have three / in them.. (http://www.google.com/)

how can i delete everything after the 3rd / ?

[NogDog]

$link = 'https://sso.sprintpcs.com/sso/registerForAccountPhoneNumberAction.do';
preg_match_all('#https?://[^/]+/#i', $link, $matches);
print_r($matches[0]);