MOBIFile::appendChapterTitle PHP Method

    public function appendChapterTitle($title)
    {
        $this->parts[] = array(self::H2, $title);
    }

     //Get title and make it a 12 character long filename
     $title = $mobi->getTitle();
     if ($title === false) {
         $title = 'file';
     }
     $title = urlencode(str_replace(' ', '_', strtolower(substr($title, 0, 12))));
     //Send the mobi file as download
     $mobi->download($title . '.mobi');
     die;
 } else {
     //Create the mobi object
     $mobi = new MOBI();
     $content = new MOBIFile();
     $content->set('title', 'My first eBook');
     $content->set('author', 'Me');
     $content->appendChapterTitle('Introduction');
     for ($i = 0, $lenI = rand(5, 10); $i < $lenI; ++$i) {
         $content->appendParagraph('P' . ($i + 1));
     }
     //Based on PHP's imagecreatetruecolor help paage
     $im = imagecreatetruecolor(220, 200);
     $text_color = imagecolorallocate($im, 233, 14, 91);
     imagestring($im, 10, 5, 5, 'A Simple Text String', $text_color);
     imagestring($im, 5, 15, 75, 'A Simple Text String', $text_color);
     imagestring($im, 3, 25, 125, 'A Simple Text String', $text_color);
     imagestring($im, 2, 10, 155, 'A Simple Text String', $text_color);
     $content->appendImage($im);
     imagedestroy($im);
     $content->appendPageBreak();
     for ($i = 0, $lenI = rand(10, 15); $i < $lenI; ++$i) {
         $content->appendChapterTitle($i + 1 . '. Chapter ' . ($i + 1));