which function can do so ?

From: Date: Sun, 04 Aug 2002 07:11:00 +0000
Subject: which function can do so ?
Groups: php.general 
Request: Send a blank email to php-general+get-111048@lists.php.net to get a copy of this message
I am exactly a beginner of php. This question may be easy. I have a php program which want to achieve the url from browser. e.g. webmail.xxx.com then how the index.php is able to know it is xxx.com ?? which function in php can do so??

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