detectar link en página

[xSkArx]

Código PHP:

$DomDocument = new DOMDocument();
$DomDocument->preserveWhiteSpace = false;
$DomDocument->load('http://www. sitio .com/index.php?option=com_xmap&view=xml&tmpl=component&id=1');
$DomNodeList = $DomDocument->getElementsByTagName('loc');
 
foreach($DomNodeList as $url) {
    $urls[] = $url->nodeValue;
}
if(in_array("http://blablalba",$urls)){
$css= '<link href="/css/xxxxxxxxxxxxxxxxxxx.css" rel="stylesheet" type="text/css" />';
}
echo $css;