$html = file_get_contents('http://www.example.com');
     
    $dom = new DOMDocument();
    @$dom->loadHTML($html);
     
    // grab all the on the page
    $xpath = new DOMXPath($dom);
    $hrefs = $xpath->evaluate("/html/body//a");
     
    for ($i = 0; $i < $hrefs->length; $i++) {
    $href = $hrefs->item($i);
    $url = $href->getAttribute('href');
    echo $url.'<br />';
    }