Code tidy.

doc/doc.php

@@ -23,7 +23,10 @@
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+// The docs should be public and not require a login, so we ignore the fact we load config here without a login check.
+// @codingStandardsIgnoreStart
 require_once(__DIR__ . '/../../../../config.php');
+// @codingStandardsIgnoreEnd
 require_once(__DIR__ . '/docslib.php');
 
 /*

plot.php

@@ -24,6 +24,8 @@
 require_once(__DIR__ . '/../../../config.php');
 require_once($CFG->libdir . '/filelib.php');
 
+require_login();
+
 $filename = clean_filename(get_file_argument());
 $filenamesplit = explode('.', $filename);
 $filetype = end($filenamesplit);

stack/input/ajax.php

@@ -29,9 +29,7 @@ $qaid  = required_param('qaid', PARAM_INT);
 $inputname = required_param('name', PARAM_ALPHANUMEXT);
 $inputvalue = required_param('input', PARAM_RAW);
 
-if (!isloggedin()) {
-    die;
-}
+require_login();
 
 // This should not be necessary, but the TeX filter requires it, because it uses $OUTPUT.
 $PAGE->set_context(context_system::instance());