public function icon($icon)
 {
     global $OUTPUT;
     if (core_useragent::supports_svg()) {
         switch ($icon) {
             case 'retweet':
                 return '<svg class="retweeticon" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 75 72"><title>' . get_string('retweet', 'block_twitter') . '</title><path d="M70.676 36.644C70.166 35.636 69.13 35 68 35h-7V19c0-2.21-1.79-4-4-4H34c-2.21 0-4 1.79-4 4s1.79 4 4 4h18c.552 0 .998.446 1 .998V35h-7c-1.13 0-2.165.636-2.676 1.644-.51 1.01-.412 2.22.257 3.13l11 15C55.148 55.545 56.046 56 57 56s1.855-.455 2.42-1.226l11-15c.668-.912.767-2.122.256-3.13zM40 48H22c-.54 0-.97-.427-.992-.96L21 36h7c1.13 0 2.166-.636 2.677-1.644.51-1.01.412-2.22-.257-3.13l-11-15C18.854 15.455 17.956 15 17 15s-1.854.455-2.42 1.226l-11 15c-.667.912-.767 2.122-.255 3.13C3.835 35.365 4.87 36 6 36h7l.012 16.003c.002 2.208 1.792 3.997 4 3.997h22.99c2.208 0 4-1.79 4-4s-1.792-4-4-4z"/></svg>';
                 break;
             case 'reply':
                 return '<svg class="replyicon" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 65 72"><title>' . get_string('reply', 'block_twitter') . '</title><path d="M41 31h-9V19c0-1.14-.647-2.183-1.668-2.688-1.022-.507-2.243-.39-3.15.302l-21 16C5.438 33.18 5 34.064 5 35s.437 1.82 1.182 2.387l21 16c.533.405 1.174.613 1.82.613.453 0 .908-.103 1.33-.312C31.354 53.183 32 52.14 32 51V39h9c5.514 0 10 4.486 10 10 0 2.21 1.79 4 4 4s4-1.79 4-4c0-9.925-8.075-18-18-18z"/></svg>';
                 break;
             case 'like':
                 return '<svg class="likeicon" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 54 72"><title>' . get_string('like', 'block_twitter') . '</title><path d="M38.723,12c-7.187,0-11.16,7.306-11.723,8.131C26.437,19.306,22.504,12,15.277,12C8.791,12,3.533,18.163,3.533,24.647 C3.533,39.964,21.891,55.907,27,56c5.109-0.093,23.467-16.036,23.467-31.353C50.467,18.163,45.209,12,38.723,12z"/></svg>';
                 break;
             default:
                 return '';
                 break;
         }
     } else {
         switch ($icon) {
             case 'retweet':
                 return $OUTPUT->pix_icon('retweet', get_string('retweet', 'block_twitter'), 'block_twitter', array('class' => 'icon default')) . $OUTPUT->pix_icon('retweet_hover', get_string('retweet', 'block_twitter'), 'block_twitter', array('class' => 'icon hover'));
                 break;
             case 'reply':
                 return $OUTPUT->pix_icon('reply', get_string('reply', 'block_twitter'), 'block_twitter', array('class' => 'icon default')) . $OUTPUT->pix_icon('reply_hover', get_string('reply', 'block_twitter'), 'block_twitter', array('class' => 'icon hover'));
                 break;
             case 'like':
                 return $OUTPUT->pix_icon('like', get_string('like', 'block_twitter'), 'block_twitter', array('class' => 'icon default')) . $OUTPUT->pix_icon('like_hover', get_string('like', 'block_twitter'), 'block_twitter', array('class' => 'icon hover'));
                 break;
             default:
                 return '';
                 break;
         }
     }
 }

 protected function is_legacy_browser()
 {
     // IE8 and IE9 are the only supported browsers that do not have spellchecker.
     if (core_useragent::is_ie() and !core_useragent::check_ie_version(10)) {
         return true;
     }
     // The rest of browsers supports spellchecking or is horribly outdated and we do not care...
     return false;
 }

    public function get_content()
    {
        global $CFG;
        if ($this->content !== null) {
            return $this->content;
        }
        $this->content = new stdClass();
        $obj = new login_msg_lib();
        $baseurl = $obj->get_base();
        $welcomepage = $obj->get_welcome();
        $jquerycdn = 'https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js';
        $databaseobj = core_useragent::instance();
        $device = $databaseobj->get_device_type();
        $jquery = <<<JQ
    <script type="text/javascript" src="{$jquerycdn}"></script>
JQ;
        if ($device == 'mobile' || $device == 'tablet') {
            $jquery = '';
        }
        if (empty($welcomepage)) {
            $popupjs = <<<HTML
        {$jquery}
HTML;
        } else {
            $popupjs = <<<HTML
        {$jquery}
        <!--ThickBox 3-->
        <script>
        // Add popup fade?
        function welcome() {
            var win_width = 600;
            var win_height = 400;
            var left = screen.width / 2 - win_width/2;
            var top = screen.height /2 - win_height/2;
            var winoptions = "width="+win_width+", height="+win_height+", top="+top+", left="+left;
            var popup = window.open("{$welcomepage}", "Welcome", winoptions );
        }
        setTimeout( function(){welcome();}, 3000); 
        </script>
HTML;
        }
        $this->content->text = <<<HTML
        {$popupjs}
        <script type="text/javascript" src="{$baseurl}js/thickbox/thickbox.js"></script>
        <link rel="stylesheet" href="{$baseurl}js/thickbox/thickbox.css" type="text/css" media="screen" />
    <!-- /ThickBox 3 -->
        <div id="log_meg_small">
            <!-- link to reopen message --!>
                <p> <a href="{$welcomepage}" target="_blank">Welcome</a> </p>
                <p> <a href="https://www.youtube.com/watch?v=GDk1YOP2f4A"
                \ttarget="_blank">Why Durabuilt?</a> </p>
        </div>
HTML;
        $this->content->footer = '';
        return $this->content;
    }

 /**
  * Pre-test setup. Preserves $CFG.
  */
 public function setUp()
 {
     parent::setUp();
     // Reset $CFG and $SERVER.
     $this->resetAfterTest();
     // Consistent initial setup: all players disabled.
     \core\plugininfo\media::set_enabled_plugins('videojs');
     // Pretend to be using Firefox browser (must support ogg for tests to work).
     core_useragent::instance(true, 'Mozilla/5.0 (X11; Linux x86_64; rv:46.0) Gecko/20100101 Firefox/46.0 ');
 }

/**
 * Returns general link or file embedding html.
 * @param string $fullurl
 * @param string $title
 * @param string $clicktoopen
 * @return string html
 */
function tab_embed_general($fullurl, $title, $clicktoopen, $mimetype)
{
    global $CFG, $PAGE;
    $iframe = false;
    $forcelink = false;
    // IE can not embed stuff properly if stored on different server.
    // That is why we use iframe instead, unfortunately this tag does not validate.
    // In xhtml strict mode.
    if ($mimetype === 'text/html' and core_useragent::check_browser_version('MSIE', 5)) {
        debugging("Detected IE", DEBUG_DEVELOPER);
        if (preg_match('(^https?://[^/]*)', $fullurl, $matches)) {
            debugging("Detected IE w/ http://", DEBUG_DEVELOPER);
            // Make sure we aren't redirecting to a moodle page.
            if (strpos($CFG->wwwroot, $matches[0]) !== 0) {
                $forcelink = true;
            } else {
                // If it is a moodle then embed as iframe.
                $iframe = true;
            }
        }
    }
    $idsuffix = md5($fullurl);
    // We force the link because IE doesn't support embedding web pages.
    if ($forcelink) {
        $clicktoopen = get_string('embed_fail_msg_ie', 'tab') . "<a href='{$fullurl}' target='_blank'>" . get_string('embed_fail_link_text', 'tab') . '</a>';
        $code = <<<EOT
<div class="resourcecontent resourcegeneral">
        {$clicktoopen}
</div>
EOT;
    } else {
        if ($iframe) {
            $code = <<<EOT
<div class="resourcecontent resourcegeneral">
  <iframe id="resourceobject_{$idsuffix}" src="{$fullurl}">
    {$clicktoopen}
  </iframe>
</div>
EOT;
        } else {
            $code = <<<EOT
<div class="resourcecontent resourcegeneral">
  <object id="resourceobject_{$idsuffix}" data="{$fullurl}" type="{$mimetype}">
    <param name="src" value="{$fullurl}" />
    {$clicktoopen}
  </object>
</div>
EOT;
        }
    }
    $PAGE->requires->js_init_call('M.mod_tab.init_maximised_embed', array("resourceobject_{$idsuffix}"), true);
    return $code;
}

 protected function can_use_drag_and_drop()
 {
     global $USER;
     $ie = core_useragent::check_browser_version('MSIE', 6.0);
     $ff = core_useragent::check_browser_version('Gecko', 20051106);
     $op = core_useragent::check_browser_version('Opera', 9.0);
     $sa = core_useragent::check_browser_version('Safari', 412);
     $ch = core_useragent::check_browser_version('Chrome', 6);
     if (!$ie && !$ff && !$op && !$sa && !$ch or !empty($USER->screenreader)) {
         return false;
     }
     return true;
 }

 public function list_supported_urls(array $urls, array $options = array())
 {
     $extensions = $this->get_supported_extensions();
     $result = array();
     foreach ($urls as $url) {
         $ext = core_media_manager::instance()->get_extension($url);
         if (in_array('.' . $ext, $extensions) && core_useragent::supports_html5($ext)) {
             // Unfortunately html5 video does not handle fallback properly.
             // https://www.w3.org/Bugs/Public/show_bug.cgi?id=10975
             // That means we need to do browser detect and not use html5 on
             // browsers which do not support the given type, otherwise users
             // will not even see the fallback link.
             $result[] = $url;
         }
     }
     return $result;
 }

/**
 * Returns whether ajax is enabled/allowed or not.
 * @param array $browsers optional list of alowed browsers, empty means use default list
 * @return bool
 */
function ajaxenabled(array $browsers = null)
{
    global $CFG;
    if (!empty($browsers)) {
        $valid = false;
        foreach ($browsers as $brand => $version) {
            if (core_useragent::check_browser_version($brand, $version)) {
                $valid = true;
            }
        }
        if (!$valid) {
            return false;
        }
    }
    if (!empty($CFG->enableajax)) {
        return true;
    } else {
        return false;
    }
}

 /**
  * This function will test directives used to serve SVG images to make sure
  * this are making the right decisions.
  */
 public function test_svg_image_use()
 {
     global $CFG;
     $this->resetAfterTest();
     // The two required tests.
     $this->assertTrue(file_exists($CFG->dirroot . '/pix/i/test.svg'));
     $this->assertTrue(file_exists($CFG->dirroot . '/pix/i/test.png'));
     $theme = theme_config::load(theme_config::DEFAULT_THEME);
     // First up test the forced setting.
     $imagefile = $theme->resolve_image_location('i/test', 'moodle', true);
     $this->assertSame('test.svg', basename($imagefile));
     $imagefile = $theme->resolve_image_location('i/test', 'moodle', false);
     $this->assertSame('test.png', basename($imagefile));
     // Now test the use of the svgicons config setting.
     // We need to clone the theme as usesvg property is calculated only once.
     $testtheme = clone $theme;
     $CFG->svgicons = true;
     $imagefile = $testtheme->resolve_image_location('i/test', 'moodle', null);
     $this->assertSame('test.svg', basename($imagefile));
     $CFG->svgicons = false;
     // We need to clone the theme as usesvg property is calculated only once.
     $testtheme = clone $theme;
     $imagefile = $testtheme->resolve_image_location('i/test', 'moodle', null);
     $this->assertSame('test.png', basename($imagefile));
     unset($CFG->svgicons);
     // Finally test a few user agents.
     $useragents = array('Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)' => false, 'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0)' => false, 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; Trident/4.0)' => false, 'Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0)' => false, 'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)' => true, 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; Trident/5.0)' => false, 'Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Trident/6.0; Touch)' => true, 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.2; Trident/6.0; Touch; .NET4.0E; .NET4.0C; Tablet PC 2.0)' => true, 'Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0)' => true, 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.3; Trident/7.0; .NET4.0E; .NET4.0C)' => true, 'Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US) AppleWebKit/534.17 (KHTML, like Gecko) Chrome/11.0.652.0 Safari/534.17' => true, 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/22.0.1207.1 Safari/537.1' => true, 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.89 Safari/537.1' => true, 'Mozilla/5.0 (Windows NT 6.1; rv:1.9) Gecko/20100101 Firefox/4.0' => true, 'Mozilla/5.0 (Windows NT 6.1; rv:15.0) Gecko/20120716 Firefox/15.0.1' => true, 'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:15.0) Gecko/20100101 Firefox/15.0.1' => true, 'Opera/9.80 (X11; Linux x86_64; U; en) Presto/2.10.289 Version/12.02' => false, 'Mozilla/5.0 (Linux; U; Android 0.5; en-us) AppleWebKit/522+ (KHTML, like Gecko) Safari/419.3' => false, 'Mozilla/5.0 (Linux; U; Android 2.3.5; en-us; HTC Vision Build/GRI40) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1' => false, 'Mozilla/5.0 (Linux; U; Android 3.0; en-us; Xoom Build/HRI39) AppleWebKit/534.13 (KHTML, like Gecko) Version/4.0 Safari/534.13' => true, 'Mozilla/5.0 (Linux; Android 4.3; it-it; SAMSUNG GT-I9505/I9505XXUEMJ7 Build/JSS15J) AppleWebKit/537.36 (KHTML, like Gecko) Version/1.5 Chrome/28.0.1500.94 Mobile Safari/537.36' => true);
     foreach ($useragents as $agent => $expected) {
         core_useragent::instance(true, $agent);
         // We need to clone the theme as usesvg property is calculated only once.
         $testtheme = clone $theme;
         $imagefile = $testtheme->resolve_image_location('i/test', 'moodle', null);
         if ($expected) {
             $this->assertSame('test.svg', basename($imagefile), 'Incorrect image returned for user agent `' . $agent . '`');
         } else {
             $this->assertSame('test.png', basename($imagefile), 'Incorrect image returned for user agent `' . $agent . '`');
         }
     }
 }

/**
 * Redirects the user to another page, after printing a notice.
 *
 * This function calls the OUTPUT redirect method, echo's the output and then dies to ensure nothing else happens.
 *
 * <strong>Good practice:</strong> You should call this method before starting page
 * output by using any of the OUTPUT methods.
 *
 * @param moodle_url|string $url A moodle_url to redirect to. Strings are not to be trusted!
 * @param string $message The message to display to the user
 * @param int $delay The delay before redirecting
 * @throws moodle_exception
 */
function redirect($url, $message = '', $delay = -1)
{
    global $OUTPUT, $PAGE, $CFG;
    if (CLI_SCRIPT or AJAX_SCRIPT) {
        // This is wrong - developers should not use redirect in these scripts but it should not be very likely.
        throw new moodle_exception('redirecterrordetected', 'error');
    }
    // Prevent debug errors - make sure context is properly initialised.
    if ($PAGE) {
        $PAGE->set_context(null);
        $PAGE->set_pagelayout('redirect');
        // No header and footer needed.
        $PAGE->set_title(get_string('pageshouldredirect', 'moodle'));
    }
    if ($url instanceof moodle_url) {
        $url = $url->out(false);
    }
    $debugdisableredirect = false;
    do {
        if (defined('DEBUGGING_PRINTED')) {
            // Some debugging already printed, no need to look more.
            $debugdisableredirect = true;
            break;
        }
        if (core_useragent::is_msword()) {
            // Clicking a URL from MS Word sends a request to the server without cookies. If that
            // causes a redirect Word will open a browser pointing the new URL. If not, the URL that
            // was clicked is opened. Because the request from Word is without cookies, it almost
            // always results in a redirect to the login page, even if the user is logged in in their
            // browser. This is not what we want, so prevent the redirect for requests from Word.
            $debugdisableredirect = true;
            break;
        }
        if (empty($CFG->debugdisplay) or empty($CFG->debug)) {
            // No errors should be displayed.
            break;
        }
        if (!function_exists('error_get_last') or !($lasterror = error_get_last())) {
            break;
        }
        if (!($lasterror['type'] & $CFG->debug)) {
            // Last error not interesting.
            break;
        }
        // Watch out here, @hidden() errors are returned from error_get_last() too.
        if (headers_sent()) {
            // We already started printing something - that means errors likely printed.
            $debugdisableredirect = true;
            break;
        }
        if (ob_get_level() and ob_get_contents()) {
            // There is something waiting to be printed, hopefully it is the errors,
            // but it might be some error hidden by @ too - such as the timezone mess from setup.php.
            $debugdisableredirect = true;
            break;
        }
    } while (false);
    // Technically, HTTP/1.1 requires Location: header to contain the absolute path.
    // (In practice browsers accept relative paths - but still, might as well do it properly.)
    // This code turns relative into absolute.
    if (!preg_match('|^[a-z]+:|', $url)) {
        // Get host name http://www.wherever.com.
        $hostpart = preg_replace('|^(.*?[^:/])/.*$|', '$1', $CFG->wwwroot);
        if (preg_match('|^/|', $url)) {
            // URLs beginning with / are relative to web server root so we just add them in.
            $url = $hostpart . $url;
        } else {
            // URLs not beginning with / are relative to path of current script, so add that on.
            $url = $hostpart . preg_replace('|\\?.*$|', '', me()) . '/../' . $url;
        }
        // Replace all ..s.
        while (true) {
            $newurl = preg_replace('|/(?!\\.\\.)[^/]*/\\.\\./|', '/', $url);
            if ($newurl == $url) {
                break;
            }
            $url = $newurl;
        }
    }
    // Sanitise url - we can not rely on moodle_url or our URL cleaning
    // because they do not support all valid external URLs.
    $url = preg_replace('/[\\x00-\\x1F\\x7F]/', '', $url);
    $url = str_replace('"', '%22', $url);
    $encodedurl = preg_replace("/\\&(?![a-zA-Z0-9#]{1,8};)/", "&amp;", $url);
    $encodedurl = preg_replace('/^.*href="([^"]*)".*$/', "\\1", clean_text('<a href="' . $encodedurl . '" />', FORMAT_HTML));
    $url = str_replace('&amp;', '&', $encodedurl);
    if (!empty($message)) {
//.........这里部分代码省略.........

/**
 * Handles the sending of file data to the user's browser, including support for
 * byteranges etc.
 *
 * The $options parameter supports the following keys:
 *  (string|null) preview - send the preview of the file (e.g. "thumb" for a thumbnail)
 *  (string|null) filename - overrides the implicit filename
 *  (bool) dontdie - return control to caller afterwards. this is not recommended and only used for cleanup tasks.
 *      if this is passed as true, ignore_user_abort is called.  if you don't want your processing to continue on cancel,
 *      you must detect this case when control is returned using connection_aborted. Please not that session is closed
 *      and should not be reopened.
 *
 * @category files
 * @param stored_file $stored_file local file object
 * @param int $lifetime Number of seconds before the file should expire from caches (null means $CFG->filelifetime)
 * @param int $filter 0 (default)=no filtering, 1=all files, 2=html files only
 * @param bool $forcedownload If true (default false), forces download of file rather than view in browser/plugin
 * @param array $options additional options affecting the file serving
 * @return null script execution stopped unless $options['dontdie'] is true
 */
function send_stored_file($stored_file, $lifetime = null, $filter = 0, $forcedownload = false, array $options = array())
{
    global $CFG, $COURSE;
    if (empty($options['filename'])) {
        $filename = null;
    } else {
        $filename = $options['filename'];
    }
    if (empty($options['dontdie'])) {
        $dontdie = false;
    } else {
        $dontdie = true;
    }
    if ($lifetime === 'default' or is_null($lifetime)) {
        $lifetime = $CFG->filelifetime;
    }
    if (!empty($options['preview'])) {
        // replace the file with its preview
        $fs = get_file_storage();
        $preview_file = $fs->get_file_preview($stored_file, $options['preview']);
        if (!$preview_file) {
            // unable to create a preview of the file, send its default mime icon instead
            if ($options['preview'] === 'tinyicon') {
                $size = 24;
            } else {
                if ($options['preview'] === 'thumb') {
                    $size = 90;
                } else {
                    $size = 256;
                }
            }
            $fileicon = file_file_icon($stored_file, $size);
            send_file($CFG->dirroot . '/pix/' . $fileicon . '.png', basename($fileicon) . '.png');
        } else {
            // preview images have fixed cache lifetime and they ignore forced download
            // (they are generated by GD and therefore they are considered reasonably safe).
            $stored_file = $preview_file;
            $lifetime = DAYSECS;
            $filter = 0;
            $forcedownload = false;
        }
    }
    // handle external resource
    if ($stored_file && $stored_file->is_external_file() && !isset($options['sendcachedexternalfile'])) {
        $stored_file->send_file($lifetime, $filter, $forcedownload, $options);
        die;
    }
    if (!$stored_file or $stored_file->is_directory()) {
        // nothing to serve
        if ($dontdie) {
            return;
        }
        die;
    }
    if ($dontdie) {
        ignore_user_abort(true);
    }
    \core\session\manager::write_close();
    // Unlock session during file serving.
    // Use given MIME type if specified, otherwise guess it using mimeinfo.
    // IE, Konqueror and Opera open html file directly in browser from web even when directed to save it to disk :-O
    // only Firefox saves all files locally before opening when content-disposition: attachment stated
    $filename = is_null($filename) ? $stored_file->get_filename() : $filename;
    $isFF = core_useragent::is_firefox();
    // only FF properly tested
    $mimetype = ($forcedownload and !$isFF) ? 'application/x-forcedownload' : ($stored_file->get_mimetype() ? $stored_file->get_mimetype() : mimeinfo('type', $filename));
    // if user is using IE, urlencode the filename so that multibyte file name will show up correctly on popup
    if (core_useragent::is_ie()) {
        $filename = rawurlencode($filename);
    }
    if ($forcedownload) {
        header('Content-Disposition: attachment; filename="' . $filename . '"');
    } else {
        header('Content-Disposition: inline; filename="' . $filename . '"');
    }
    if ($lifetime > 0) {
        $private = '';
        if (isloggedin() and !isguestuser()) {
            $private = ' private,';
        }
//.........这里部分代码省略.........

 /**
  * Will get called before the login page is shownr. Ff NTLM SSO
  * is enabled, and the user is in the right network, we'll redirect
  * to the magic NTLM page for SSO...
  *
  */
 function loginpage_hook()
 {
     global $CFG, $SESSION;
     // HTTPS is potentially required
     //httpsrequired(); - this must be used before setting the URL, it is already done on the login/index.php
     if (($_SERVER['REQUEST_METHOD'] === 'GET' || $_SERVER['REQUEST_METHOD'] === 'POST' && get_local_referer() != strip_querystring(qualified_me())) && !empty($this->config->ntlmsso_enabled) && !empty($this->config->ntlmsso_subnet) && empty($_GET['authldap_skipntlmsso']) && (isguestuser() || !isloggedin()) && address_in_subnet(getremoteaddr(), $this->config->ntlmsso_subnet)) {
         // First, let's remember where we were trying to get to before we got here
         if (empty($SESSION->wantsurl)) {
             $SESSION->wantsurl = null;
             $referer = get_local_referer(false);
             if ($referer && $referer != $CFG->wwwroot && $referer != $CFG->wwwroot . '/' && $referer != $CFG->httpswwwroot . '/login/' && $referer != $CFG->httpswwwroot . '/login/index.php') {
                 $SESSION->wantsurl = $referer;
             }
         }
         // Now start the whole NTLM machinery.
         if ($this->config->ntlmsso_ie_fastpath == AUTH_NTLM_FASTPATH_YESATTEMPT || $this->config->ntlmsso_ie_fastpath == AUTH_NTLM_FASTPATH_YESFORM) {
             if (core_useragent::is_ie()) {
                 $sesskey = sesskey();
                 redirect($CFG->wwwroot . '/auth/ldap/ntlmsso_magic.php?sesskey=' . $sesskey);
             } else {
                 if ($this->config->ntlmsso_ie_fastpath == AUTH_NTLM_FASTPATH_YESFORM) {
                     redirect($CFG->httpswwwroot . '/login/index.php?authldap_skipntlmsso=1');
                 }
             }
         }
         redirect($CFG->wwwroot . '/auth/ldap/ntlmsso_attempt.php');
     }
     // No NTLM SSO, Use the normal login page instead.
     // If $SESSION->wantsurl is empty and we have a 'Referer:' header, the login
     // page insists on redirecting us to that page after user validation. If
     // we clicked on the redirect link at the ntlmsso_finish.php page (instead
     // of waiting for the redirection to happen) then we have a 'Referer:' header
     // we don't want to use at all. As we can't get rid of it, just point
     // $SESSION->wantsurl to $CFG->wwwroot (after all, we came from there).
     if (empty($SESSION->wantsurl) && get_local_referer() == $CFG->httpswwwroot . '/auth/ldap/ntlmsso_finish.php') {
         $SESSION->wantsurl = $CFG->wwwroot;
     }
 }

/**
 * Checks if current user is a web crawler.
 *
 * This list can not be made complete, this is not a security
 * restriction, we make the list only to help these sites
 * especially when automatic guest login is disabled.
 *
 * If admin needs security they should enable forcelogin
 * and disable guest access!!
 *
 * @return bool
 * @deprecated since Moodle 3.0 use \core_useragent::is_web_crawler instead.
 */
function is_web_crawler()
{
    debugging('is_web_crawler() has been deprecated, please use core_useragent::is_web_crawler() instead.', DEBUG_DEVELOPER);
    return core_useragent::is_web_crawler();
}

    <!-- End Analytics -->
</head>

<body <?php 
echo $OUTPUT->body_attributes($bodyclasses);
?>
>

<?php 
echo $OUTPUT->standard_top_of_body_html();
?>

<?php 
// If on desktop, then hide the header/footer.
$hideclass = '';
$devicetype = core_useragent::get_device_type();
if ($devicetype !== 'mobile' and $devicetype !== 'tablet') {
    // We can not use the Bootstrap responsive css classes because popups are phone sized on desktop.
    $hideclass = 'hide';
}
?>

<header role="banner" class="navbar navbar-fixed-top moodle-has-zindex <?php 
echo $hideclass;
?>
">
    <nav role="navigation" class="navbar-inner">
        <div class="container-fluid">
            <a class="brand" href="<?php 
echo $CFG->wwwroot;
?>

    }
}
echo '</select> <input type="submit" value="' . get_string('showsession', 'realtimequiz') . '" /></form></center>';
if ($CFG->version < 2013111800) {
    $tickimg = '<img src="' . $OUTPUT->pix_url('i/tick_green_big') . '" alt="' . get_string('tick', 'realtimequiz') . '" />';
    $crossimg = '<img src="' . $OUTPUT->pix_url('i/cross_red_big') . '" alt="' . get_string('cross', 'realtimequiz') . '" />';
} else {
    $tickimg = '<img src="' . $OUTPUT->pix_url('i/grade_correct') . '" alt="' . get_string('tick', 'realtimequiz') . '" />';
    $crossimg = '<img src="' . $OUTPUT->pix_url('i/grade_incorrect') . '" alt="' . get_string('cross', 'realtimequiz') . '" />';
}
if ($questionid == 0) {
    // Show all of the questions
    if ($CFG->version < 2013111800) {
        $isff = check_browser_version('Gecko');
    } else {
        $isff = core_useragent::check_browser_version('Gecko');
    }
    if ($isff) {
        $blankcolspan = 'colspan="999" ';
    } else {
        $blankcolspan = '';
    }
    $questions = $DB->get_records('realtimequiz_question', array('quizid' => $realtimequiz->id), 'questionnum');
    $linkurl = new moodle_url('/mod/realtimequiz/responses.php', array('id' => $cm->id, 'showsession' => $showsession));
    if ($showusers) {
        $linkurl->param('showusers', 1);
        if ($CFG->version < 2013111800) {
            $usernames = 'u.firstname, u.lastname';
        } else {
            $usernames = get_all_user_name_fields(true, 'u');
        }

                    define('NO_MOODLE_COOKIES', false);
                }
            }
        }
    }
}
// Start session and prepare global $SESSION, $USER.
if (empty($CFG->sessiontimeout)) {
    $CFG->sessiontimeout = 7200;
}
\core\session\manager::start();
// Set default content type and encoding, developers are still required to use
// echo $OUTPUT->header() everywhere, anything that gets set later should override these headers.
// This is intended to mitigate some security problems.
if (AJAX_SCRIPT) {
    if (!core_useragent::supports_json_contenttype()) {
        // Some bloody old IE.
        @header('Content-type: text/plain; charset=utf-8');
        @header('X-Content-Type-Options: nosniff');
    } else {
        if (!empty($_FILES)) {
            // Some ajax code may have problems with json and file uploads.
            @header('Content-type: text/plain; charset=utf-8');
        } else {
            @header('Content-type: application/json; charset=utf-8');
        }
    }
} else {
    if (!CLI_SCRIPT) {
        @header('Content-type: text/html; charset=utf-8');
    }

 /**
  * Get an instance of the user agent object.
  *
  * @param bool $reload If set to true the user agent will be reset and all ascertations remade.
  * @param string $forceuseragent The string to force as the user agent, don't use unless absolutely unavoidable.
  * @return core_useragent
  */
 public static function instance($reload = false, $forceuseragent = null)
 {
     if (!self::$instance || $reload) {
         self::$instance = new core_useragent($forceuseragent);
     }
     return self::$instance;
 }

 /**
  * Sets user agent to Firefox.
  */
 private function pretend_to_be_firefox()
 {
     // Pretend to be using Firefox browser (must support ogg for tests to work).
     core_useragent::instance(true, 'Mozilla/5.0 (Windows NT 6.1; rv:8.0) Gecko/20100101 Firefox/8.0');
 }

 /**
  * States if the browser is IE by returning properties, otherwise false.
  */
 public function theme_essential_ie_properties()
 {
     $properties = core_useragent::check_ie_properties();
     // In /lib/classes/useragent.php.
     if (!is_array($properties)) {
         return false;
     } else {
         return $properties;
     }
 }

 /**
  * Close the Moodle Workbook
  */
 public function close()
 {
     global $CFG;
     foreach ($this->objPHPExcel->getAllSheets() as $sheet) {
         $sheet->setSelectedCells('A1');
     }
     $this->objPHPExcel->setActiveSheetIndex(0);
     $filename = preg_replace('/\\.xlsx?$/i', '', $this->filename);
     $mimetype = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet';
     $filename = $filename . '.xlsx';
     if (is_https()) {
         // HTTPS sites - watch out for IE! KB812935 and KB316431.
         header('Cache-Control: max-age=10');
         header('Expires: ' . gmdate('D, d M Y H:i:s', 0) . ' GMT');
         header('Pragma: ');
     } else {
         //normal http - prevent caching at all cost
         header('Cache-Control: private, must-revalidate, pre-check=0, post-check=0, max-age=0');
         header('Expires: ' . gmdate('D, d M Y H:i:s', 0) . ' GMT');
         header('Pragma: no-cache');
     }
     if (core_useragent::is_ie()) {
         $filename = rawurlencode($filename);
     } else {
         $filename = s($filename);
     }
     header('Content-Type: ' . $mimetype);
     header('Content-Disposition: attachment;filename="' . $filename . '"');
     $objWriter = PHPExcel_IOFactory::createWriter($this->objPHPExcel, $this->type);
     $objWriter->save('php://output');
 }