diff --git a/functions.php b/functions.php
index 185df5c9de..34e25f5006 100644
--- a/functions.php
+++ b/functions.php
@@ -666,7 +666,15 @@ function getTerms($connection2, $gibbonSchoolYearID, $short = false)
     return $output;
 }
 
-//Array sort for multidimensional arrays
+/**
+ * Array sort for multidimensional arrays.
+ *
+ * Deprecated in favor of native usort.
+ *
+ * @since 2013
+ * @version v12.0.00
+ * @deprecated v26.0.00
+ */
 function msort($array, $id = 'id', $sort_ascending = true)
 {
     $temp_array = array();
diff --git a/modules/Planner/moduleFunctions.php b/modules/Planner/moduleFunctions.php
index a1f2978c42..39b5078538 100644
--- a/modules/Planner/moduleFunctions.php
+++ b/modules/Planner/moduleFunctions.php
@@ -674,7 +674,8 @@ function getResourcesTagCloud($guid, $connection2, $tagCount = 50) {
             ++$count;
         }
 
-        $tags = msort($tags, 0, true);
+        // Sort tags by the value of their tag name (i.e. key=0) asecendingly.
+        usort($tags, fn($a, $b) => $a[0] <=> $b[0]);
 
         $min_font_size = 16;
         $max_font_size = 30;
diff --git a/modules/Timetable/moduleFunctions.php b/modules/Timetable/moduleFunctions.php
index 079ff24c83..a712ab4618 100644
--- a/modules/Timetable/moduleFunctions.php
+++ b/modules/Timetable/moduleFunctions.php
@@ -795,7 +795,9 @@ function renderTT($guid, $connection2, $gibbonPersonID, $gibbonTTID, $title = ''
                     $eventsCombined = $eventsPersonal;
                 }
 
-                $eventsCombined = msort($eventsCombined, 2, true);
+                // Sort $eventsCombined by the value of their start timestamp (key = 2) ascendingly.
+                // See getCalendarEvents() for field details of each events.
+                usort($eventsCombined, fn($a, $b) => $a[2] <=> $b[2]);
 
                 $currentAllDays = 0;
                 $lastDate = '';