/**
 * Removes unnecessary whitelines and breakspaces.
 * @param string $buffer HTML output
 * @return string Sanitized output
 * @author Marvin Thomas Rabe
 */
function sanitize_output($buffer) {
        $ignored = array();
        $i = 0;
        preg_match_all("/<textarea[^>]*?>(.*?)<\/textarea>/s", $buffer, $expr);
        foreach ($expr[0] as $k => $v) {
                $ignored[$i] = $expr[0][$k];
                $buffer = str_replace($expr[0][$k], '<='.$i.'=>', $buffer);
                $i++;
        }

        preg_match_all("/<script[^>]*?>(.*?)<\/script>/s", $buffer, $expr);
        foreach ($expr[1] as $k => $v) {
                if(empty($expr[1][$k]))
                        continue;
                $temp = preg_replace('/\s+\/{2,}.*\s+/', '', $expr[1][$k]);
                $temp = preg_replace('/\s+\/\*.*\*\/\s+/s', '', $temp);
                $buffer = str_replace($expr[1][$k], $temp, $buffer);
        }

        $buffer = preg_replace('/\n\r|\r\n|\n|\r|\t/', '', $buffer);
        $buffer = preg_replace('/ {2,}/', ' ', $buffer);

        foreach($ignored as $k => $v) {
                $buffer = preg_replace('/<='.$k.'=>/', $v, $buffer);
        }

        return $buffer;
}