diff --git a/admin/api_settings.php b/admin/api_settings.php
index 02c7a5ea..61a14abc 100644
--- a/admin/api_settings.php
+++ b/admin/api_settings.php
@@ -141,7 +141,7 @@ require_once(HESK_PATH . 'inc/show_admin_nav.inc.php');
                         User Security
                     </div>
                     <?php
-                    $users = [];
+                    $users = array();
                     $userRs = hesk_dbQuery("SELECT `id`, `user`, `name` FROM `" . hesk_dbEscape($hesk_settings['db_pfix']) . "users` WHERE `active` = '1'");
                     while ($row = hesk_dbFetchAssoc($userRs)) {
                         $row['number_of_tokens'] = 0;
diff --git a/admin/calendar.php b/admin/calendar.php
index 271fe8a3..6f9b0dbb 100644
--- a/admin/calendar.php
+++ b/admin/calendar.php
@@ -59,7 +59,7 @@ if ($modsForHesk_settings['enable_calendar'] == '0') {
 // Get categories for the dropdown
 $order_by = $modsForHesk_settings['category_order_column'];
 $rs = hesk_dbQuery("SELECT `id`, `name`, `color` FROM `" . hesk_dbEscape($hesk_settings['db_pfix']) . "categories` WHERE `usage` <> 1 ORDER BY `" . hesk_dbEscape($order_by) . "`");
-$categories = [];
+$categories = array();
 while ($row = hesk_dbFetchAssoc($rs)) {
     if (!$_SESSION['isadmin'] && !in_array($row['id'], $_SESSION['categories'])) {
         continue;
diff --git a/api/businesslogic/ticket_retriever.php b/api/businesslogic/ticket_retriever.php
index 1f91da1e..eaa06d5c 100644
--- a/api/businesslogic/ticket_retriever.php
+++ b/api/businesslogic/ticket_retriever.php
@@ -10,7 +10,7 @@ function get_ticket_for_staff($hesk_settings, $user, $id = NULL) {
 
     if ($id === NULL) {
         $original_tickets = $tickets;
-        $tickets = [];
+        $tickets = array();
         foreach ($original_tickets as $ticket) {
             $ticket = remove_common_properties($ticket);
             $ticket = convert_to_camel_case($ticket);
diff --git a/api/businesslogic/user_retriever.php b/api/businesslogic/user_retriever.php
index c184f5be..69b3f330 100644
--- a/api/businesslogic/user_retriever.php
+++ b/api/businesslogic/user_retriever.php
@@ -6,7 +6,7 @@ function retrieve_user($hesk_settings, $id = NULL) {
 
     if ($id === NULL) {
         $original_users = $users;
-        $users = [];
+        $users = array();
         foreach ($original_users as $user) {
             $user = remove_unneeded_properties($user);
             $user = convert_to_camel_case($user);
diff --git a/api/dao/canned_dao.php b/api/dao/canned_dao.php
index 07725436..e4700491 100644
--- a/api/dao/canned_dao.php
+++ b/api/dao/canned_dao.php
@@ -12,7 +12,7 @@ function get_canned_response($hesk_settings, $id = NULL) {
         return NULL;
     }
 
-    $results = [];
+    $results = array();
     while ($row = hesk_dbFetchAssoc($response)) {
         $row['id'] = intval($row['id']);
 
diff --git a/api/dao/category_dao.php b/api/dao/category_dao.php
index 24e0ddf7..d92ea51c 100644
--- a/api/dao/category_dao.php
+++ b/api/dao/category_dao.php
@@ -12,7 +12,7 @@ function get_category($hesk_settings, $id = NULL) {
         return NULL;
     }
 
-    $results = [];
+    $results = array();
     while ($row = hesk_dbFetchAssoc($response)) {
         $row['id'] = intval($row['id']);
         $row['displayOrder'] = intval($row['cat_order']);
diff --git a/api/dao/status_dao.php b/api/dao/status_dao.php
index fba8b4ba..160ddd2d 100644
--- a/api/dao/status_dao.php
+++ b/api/dao/status_dao.php
@@ -12,7 +12,7 @@ function get_status($hesk_settings, $id = NULL) {
         return NULL;
     }
 
-    $results = [];
+    $results = array();
     while ($row = hesk_dbFetchAssoc($response)) {
         $row['id'] = intval($row['ID']);
         unset($row['ID']);
@@ -37,7 +37,7 @@ function get_status($hesk_settings, $id = NULL) {
         $language_rs = hesk_dbQuery($language_sql);
         if (hesk_dbNumRows($language_rs) > 0) {
             $row['key'] = NULL;
-            $row['keys'] = [];
+            $row['keys'] = array();
         }
         while ($language_row = hesk_dbFetchAssoc($language_rs)) {
             unset($language_row['id']);
diff --git a/api/dao/ticket_dao.php b/api/dao/ticket_dao.php
index fbf10fc3..88ae5047 100644
--- a/api/dao/ticket_dao.php
+++ b/api/dao/ticket_dao.php
@@ -31,7 +31,7 @@ function get_ticket_for_id($hesk_settings, $user, $id = NULL) {
 }
 
 function build_results($response) {
-    $results = [];
+    $results = array();
     while ($row = hesk_dbFetchAssoc($response)) {
         $row['id'] = intval($row['id']);
         $row['category'] = intval($row['category']);
diff --git a/api/dao/ticket_template_dao.php b/api/dao/ticket_template_dao.php
index 6335378d..118ba218 100644
--- a/api/dao/ticket_template_dao.php
+++ b/api/dao/ticket_template_dao.php
@@ -12,7 +12,7 @@ function get_ticket_template($hesk_settings, $id = NULL) {
         return NULL;
     }
 
-    $results = [];
+    $results = array();
     while ($row = hesk_dbFetchAssoc($response)) {
         $row['id'] = intval($row['id']);
         $row['displayOrder'] = intval($row['tpl_order']);
diff --git a/api/dao/user_dao.php b/api/dao/user_dao.php
index e7b343c8..f56158fb 100644
--- a/api/dao/user_dao.php
+++ b/api/dao/user_dao.php
@@ -13,7 +13,7 @@ function get_user($hesk_settings, $id = NULL) {
         return NULL;
     }
 
-    $results = [];
+    $results = array();
     while ($row = hesk_dbFetchAssoc($response)) {
         $row['id'] = intval($row['id']);
         $row['isadmin'] = get_boolean($row['isadmin']);
diff --git a/api/priority/index.php b/api/priority/index.php
index 8ef5ecd7..d0e161d6 100644
--- a/api/priority/index.php
+++ b/api/priority/index.php
@@ -27,7 +27,7 @@ $request_method = $_SERVER['REQUEST_METHOD'];
  *     }
  */
 if ($request_method == 'GET') {
-    $results = [];
+    $results = array();
     $critical['id'] = 0;
     $critical['key'] = 'critical';
     $results[] = $critical;
diff --git a/calendar.php b/calendar.php
index c43e5308..48091c89 100644
--- a/calendar.php
+++ b/calendar.php
@@ -52,7 +52,7 @@ if ($modsForHesk_settings['enable_calendar'] != '1') {
     hesk_error($hesklang['calendar_disabled']);
 }
 
-$categories = [];
+$categories = array();
 $orderBy = $modsForHesk_settings['category_order_column'];
 $categorySql = "SELECT * FROM `" . hesk_dbEscape($hesk_settings['db_pfix']) . "categories` WHERE `usage` <> 1 AND `type` = '0' ORDER BY '" . $orderBy . "'";
 $categoryRs = hesk_dbQuery($categorySql);
diff --git a/cron/calendar_reminders.php b/cron/calendar_reminders.php
index a0404b29..b45ddf2f 100644
--- a/cron/calendar_reminders.php
+++ b/cron/calendar_reminders.php
@@ -67,8 +67,8 @@ $sql = "SELECT `reminder`.`id` AS `reminder_id`, `reminder`.`user_id` AS `user_i
     AND `email_sent` = '0'";
 
 $rs = hesk_dbQuery($sql);
-$reminders_to_flag = [];
-$tickets_to_flag = [];
+$reminders_to_flag = array();
+$tickets_to_flag = array();
 
 $included_email_functions = false;
 if (hesk_dbNumRows($rs) > 0 && !$skip_events) {
@@ -150,12 +150,12 @@ $user_rs = hesk_dbQuery("SELECT `id`, `isadmin`, `categories`, `email`,
     FROM `" . hesk_dbEscape($hesk_settings['db_pfix']) . "users` WHERE `notify_overdue_unassigned` = '1'
     AND (`heskprivileges` LIKE '%can_view_tickets%' OR `isadmin` = '1')");
 
-$users = [];
+$users = array();
 while ($row = hesk_dbFetchAssoc($user_rs)) {
     $users[] = $row;
 }
 
-$tickets_to_flag = [];
+$tickets_to_flag = array();
 while ($row = hesk_dbFetchAssoc($rs)) {
     if (mfh_sendOverdueTicketReminder($row, $users, $modsForHesk_settings)) {
         $tickets_to_flag[] = $row['id'];
diff --git a/inc/email_functions.inc.php b/inc/email_functions.inc.php
index 9b249330..a3ba0e6f 100644
--- a/inc/email_functions.inc.php
+++ b/inc/email_functions.inc.php
@@ -338,7 +338,7 @@ function mfh_sendOverdueTicketReminder($ticket, $users, $modsForHesk_settings) {
     $htmlMessage = hesk_getHtmlMessage('overdue_ticket', NULL, $modsForHesk_settings, 1, 0, 1);
     $htmlMessage = hesk_processMessage($htmlMessage, $ticket, 1, 1, 0, $modsForHesk_settings, 1);
 
-    $emails = [];
+    $emails = array();
     if ($ticket['user_email'] != NULL) {
         $emails[] = $ticket['user_email'];
     }
diff --git a/internal-api/dao/calendar_dao.php b/internal-api/dao/calendar_dao.php
index cf379e85..2e8ae644 100644
--- a/internal-api/dao/calendar_dao.php
+++ b/internal-api/dao/calendar_dao.php
@@ -26,7 +26,7 @@ function get_events($start, $end, $hesk_settings, $staff = true) {
 
     $rs = hesk_dbQuery($sql);
 
-    $events = [];
+    $events = array();
     while ($row = hesk_dbFetchAssoc($rs)) {
         // Skip the event if the user does not have access to it
         if ($staff && !$_SESSION['isadmin'] && !in_array($row['category'], $_SESSION['categories'])) {
diff --git a/internal-api/dao/message_log_dao.php b/internal-api/dao/message_log_dao.php
index 281c8496..cb8ddece 100644
--- a/internal-api/dao/message_log_dao.php
+++ b/internal-api/dao/message_log_dao.php
@@ -26,7 +26,7 @@ function search_log($hesk_settings, $location, $from_date, $to_date, $severity_i
 
     $rs = hesk_dbQuery($sql);
 
-    $results = [];
+    $results = array();
     while ($row = hesk_dbFetchAssoc($rs)) {
         $row['timestamp'] = hesk_date($row['timestamp'], true);
         $results[] = $row;