$str = '<!DOCTYPE html><html><head><title>[PHP] HTML Beautifier</title></head><body><div><h2>Example</h2><p>Hello World!</p><ol><li>line 1</li><li>line 2</li><li>line 3</li></ol></div></body></html>';

include 'ganon.php';
$html = str_get_dom($str);

//** Beautify HTML *//
dom_format($html, array('attributes_case' => CASE_LOWER));
echo $html; // Hasil