function getlinks($url) {
    $media=preg_split('/(href\=\"|href\=\'|href\=|src\=\"|src\=\'|src\=)/i',$url);
    $media=preg_replace("/([^\'])\'(.*)/is",'$1',$media);
    $media=preg_replace("/([^\"])\"(.*)/is",'$1',$media);
    $media=preg_replace("/([^\>])\>(.*)/is",'$1',$media);
    $media=preg_replace("/([^\'])\'(.*)/i",'$1',$media);
    $media=preg_replace("/([^\"])\"(.*)/i",'$1',$media);
    $media=preg_replace("/([^\>])\>(.*)/i",'$1',$media);
    $media=preg_replace("/([^ ])\ [0-9\'\"\>\/](.*)/is",'$1',$media);
    $media=@preg_replace("/([^ ])\ [0-9\'\"\>\/](.*)/i",'$1',$media);
    $mediaext=preg_replace("/.*[.]([^.]+)/",'$1',$media);
    return $media;
    }
//above function returns an array

<?
function getlinks($url) {
    $data=file_get_contents($url);
    preg_match_all('/(href|src)\=(\"|\')[^\"\'\>]+/i',$data,$media);
    unset($data);
    $data=preg_replace('/(href|src)(\"|\'|\=\"|\=\')(.*)/i',"$3",$media[0]);
    return $data;
    }
 
//now to use the function
echo "<xmp>";
var_dump(getlinks('http://www.google.com.au'));
echo "</xmp>";
?>

<?php
$sUrl = 'http://www.google.com';
 
$oDom = new DomDocument();
@$oDom->loadHTMLFile( $sUrl );
 
$oXpath = new DomXpath($oDom);
 
//Could also be //@href | //@src i just think the one used gives you more finite control over the result set.
$oRes = $oXpath->query("//a/@href | //img/@src | //script/@src");
 
$i=0;
foreach($oRes as $h1) {
	echo $h1->nodeValue . '<br>';
	$i++;
}
 
echo $i.' urls found in page.<br /><br />';

http://images.google.com/imghp?hl=en&tab=wi
http://maps.google.com/maps?hl=en&tab=wl
http://news.google.com/nwshp?hl=en&tab=wn
http://video.google.com/?hl=en&tab=wv
http://mail.google.com/mail/?hl=en&tab=wm
http://www.google.com/intl/en/options/
http://www.google.com/prdhp?hl=en&tab=wf
http://groups.google.com/grphp?hl=en&tab=wg
http://books.google.com/bkshp?hl=en&tab=wp
http://scholar.google.com/schhp?hl=en&tab=ws
http://www.google.com/finance?hl=en&tab=we
http://blogsearch.google.com/?hl=en&tab=wb
http://www.youtube.com/?hl=en&tab=w1
http://www.google.com/calendar/render?hl=en&tab=wc
http://picasaweb.google.com/home?hl=en&tab=wq
http://docs.google.com/?hl=en&tab=wo
http://www.google.com/reader/view/?hl=en&tab=wy
http://sites.google.com/?hl=en&tab=w3
http://www.google.com/intl/en/options/
/url?sa=p&pref=ig&pval=3&q=http://www.google.com/ig%3Fhl%3Den%26source%3Diglk&usg=AFQjCNFA18XPfgb7dKnXfKz7x7g1GDH1tg
https://www.google.com/accounts/Login?continue=http://www.google.com/&hl=en
/intl/en_ALL/images/logo.gif
/advanced_search?hl=en
/preferences?hl=en
/language_tools?hl=en
/intl/en/ads/
/services/
/intl/en/about.html
/intl/en/privacy.html
29 links found in page.