$cmd = "timeout 300s $xvfb --auto-servernum $webkitpdf " .
" --url " . escapeshellarg($_REQUEST['url']) . ' ' .
" --pdf " . $out . ' ';
$cmd = "timeout 300s $xvfb --auto-servernum $webkitpdf " .
" --url " . escapeshellarg($_REQUEST['url']) . ' ' .
" --pdf " . $out . ' ';