Links

<?php

$curl = curl_init();

curl_setopt($curl, CURLOPT_URL, "http://foro.elhacker.net");
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);

$response = curl_exec($curl);

$document = new DOMDocument();
@$document->loadHTML($response);

$links = $document->getElementsByTagName("a");
$href = array();
foreach($links as $link){
    $node = $link->attributes->getNamedItem("href");
    if($node != NULL){
        $href[] = $node->nodeValue;
    }
}

print_r($href);

?>