diff --git a/add_form.php b/add_form.php
index fe4bbed..447a940 100644
--- a/add_form.php
+++ b/add_form.php
@@ -253,10 +253,10 @@ class mod_attendance_add_form extends moodleform {
             $mform->hideif('subnetgrp', 'studentscanmark', 'notchecked');
             $mform->hideif('subnet', 'usedefaultsubnet', 'checked');
 
-
             $mgroup3 = array();
             $options = attendance_get_sharedipoptions();
-            $mgroup3[] = & $mform->createElement('select', 'preventsharedip', get_string('preventsharedip', 'attendance'), $options);
+            $mgroup3[] = & $mform->createElement('select', 'preventsharedip',
+                get_string('preventsharedip', 'attendance'), $options);
             $mgroup3[] = & $mform->createElement('text', 'preventsharediptime',
                 get_string('preventsharediptime', 'attendance'), '', 'test');
             $mform->addGroup($mgroup3, 'preventsharedgroup', get_string('preventsharedip', 'attendance'), array(' '), false);
diff --git a/classes/calendar_helpers.php b/classes/calendar_helpers.php
index ce9472e..580721f 100644
--- a/classes/calendar_helpers.php
+++ b/classes/calendar_helpers.php
@@ -116,14 +116,13 @@ function attendance_update_calendar_event($session) {
     // Should there even be an event?
     if ($session->calendarevent == 0) {
         if ($session->caleventid != 0) {
-            // There is an existing event we should delete
-            // (calendarevent option just got turned off)
+            // There is an existing event we should delete, calendarevent just got turned off.
             $DB->delete_records_list('event', 'id', array($caleventid));
             $session->caleventid = 0;
             $DB->update_record('attendance_sessions', $session);
             return true;
         } else {
-            // This should be the common case when session does not want event
+            // This should be the common case when session does not want event.
             return true;
         }
     }
diff --git a/classes/structure.php b/classes/structure.php
index 1df808a..0bda822 100644
--- a/classes/structure.php
+++ b/classes/structure.php
@@ -1289,7 +1289,8 @@ class mod_attendance_structure {
                 $gradeitem = grade_item::fetch(array('courseid' => $this->course->id, 'itemtype' => 'mod',
                     'itemmodule' => 'attendance', 'iteminstance' => $this->id));
                 if ($gradeitem->gradepass > 0 && $gradeitem->grademax != $gradeitem->grademin) {
-                    $this->lowgradethreshold = ($gradeitem->gradepass - $gradeitem->grademin) / ($gradeitem->grademax - $gradeitem->grademin);
+                    $this->lowgradethreshold = ($gradeitem->gradepass - $gradeitem->grademin) /
+                        ($gradeitem->grademax - $gradeitem->grademin);
                 }
             }
         }
diff --git a/db/upgrade.php b/db/upgrade.php
index fc4588e..6790614 100644
--- a/db/upgrade.php
+++ b/db/upgrade.php
@@ -518,7 +518,7 @@ function xmldb_attendance_upgrade($oldversion=0) {
         if (!$dbman->field_exists($table, $field)) {
             $dbman->add_field($table, $field);
             if (empty(get_config('attendance', 'enablecalendar'))) {
-                // Calendar disabled on this site, set calendarevent for existing records to 0;
+                // Calendar disabled on this site, set calendarevent for existing records to 0.
                 $DB->execute("UPDATE {attendance_sessions} set calendarevent = 0");
             }
         }
diff --git a/locallib.php b/locallib.php
index 98b9fb0..6bb233d 100644
--- a/locallib.php
+++ b/locallib.php
@@ -588,7 +588,7 @@ function attendance_construct_sessions_data_for_add($formdata, mod_attendance_st
     }
 
     $calendarevent = 0;
-    if (isset($formdata->calendarevent)) { // Calendar event should be created
+    if (isset($formdata->calendarevent)) { // Calendar event should be created.
         $calendarevent = 1;
     }
 
diff --git a/update_form.php b/update_form.php
index 113f9cd..3790ecf 100644
--- a/update_form.php
+++ b/update_form.php
@@ -171,7 +171,8 @@ class mod_attendance_update_form extends moodleform {
 
             $mgroup3 = array();
             $options = attendance_get_sharedipoptions();
-            $mgroup3[] = & $mform->createElement('select', 'preventsharedip', get_string('preventsharedip', 'attendance'), $options);
+            $mgroup3[] = & $mform->createElement('select', 'preventsharedip',
+                get_string('preventsharedip', 'attendance'), $options);
             $mgroup3[] = & $mform->createElement('text', 'preventsharediptime',
                 get_string('preventsharediptime', 'attendance'), '', 'test');
             $mform->addGroup($mgroup3, 'preventsharedgroup',