$pesquisa = str_replace(' ', '+', $_GET['q']);
$musica = file_get_contents('http://search.4shared.com/q/CCQD/1/music/' .$pesquisa);
$pos = strpos($musica, "showMediaPreview(event, '") + 25;
$resto = strpos($musica, "/preview.mp3") + 12;
$link = substr($musica, $pos, $resto-$pos);
echo $link;