How can I obtain a relative link when using the following function

From: tim koster (tim.koster_at_gmx.net)
Date: 11/28/03 

Date: 27 Nov 2003 23:41:00 -0800

hi,

i am using the code below, to fetch information from another webpage
(e.g. www.testpage.com). i fetch the text from the word "begin_text"
zu the word "end_text".

I would like to fetch complete links instead of relative links. at the
moment the fetched link looks like this "../smile.gif". insted of
 this i would like to retreive the original "full" link
("http://www.testpage.com/smile.gif"). is this
possibloe in php?

tim

function string_zerlegen ($gesamt, $startstring, $endstring)
{
$zwischen=explode ($startstring, $gesamt);
$ergebnis=explode ($endstring, $zwischen[1]);
return $ergebnis[0];
}
{
$url="http://www.testpage.com";
$starttext="begin_text";
$endtext="end_text";
$seite= implode ('', file ($url));
echo string_zerlegen ($seite, $starttext, $endtext);
}

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