diff --git a/lib/classes/shutdown_manager.php b/lib/classes/shutdown_manager.php
index 101b4a1417b..ffd0da99485 100644
--- a/lib/classes/shutdown_manager.php
+++ b/lib/classes/shutdown_manager.php
@@ -144,7 +144,7 @@ class core_shutdown_manager {
             error_log('Invalid custom shutdown function detected '.var_export($callback, true));
             // @codingStandardsIgnoreEnd
         }
-        self::$callbacks[] = [$callback, $params ?? []];
+        self::$callbacks[] = [$callback, $params ? array_values($params) : []];
     }
 
     /**
diff --git a/lib/ddl/sql_generator.php b/lib/ddl/sql_generator.php
index 99fd21f1390..6215eb1e2c0 100644
--- a/lib/ddl/sql_generator.php
+++ b/lib/ddl/sql_generator.php
@@ -1237,7 +1237,7 @@ abstract class sql_generator {
         }
 
         // Now call the standard $DB->sql_concat() DML function
-        return call_user_func_array(array($this->mdb, 'sql_concat'), $elements);
+        return call_user_func_array(array($this->mdb, 'sql_concat'), array_values($elements));
     }
 
     /**
diff --git a/lib/dml/sqlsrv_native_moodle_database.php b/lib/dml/sqlsrv_native_moodle_database.php
index 799438b6591..a359c8999e8 100644
--- a/lib/dml/sqlsrv_native_moodle_database.php
+++ b/lib/dml/sqlsrv_native_moodle_database.php
@@ -1426,7 +1426,7 @@ class sqlsrv_native_moodle_database extends moodle_database {
         for ($n = count($elements) - 1; $n > 0; $n--) {
             array_splice($elements, $n, 0, $separator);
         }
-        return call_user_func_array(array($this, 'sql_concat'), $elements);
+        return call_user_func_array(array($this, 'sql_concat'), array_values($elements));
     }
 
     public function sql_isempty($tablename, $fieldname, $nullablefield, $textfield) {
diff --git a/lib/moodlelib.php b/lib/moodlelib.php
index e9947ad1bad..75ac71f4bde 100644
--- a/lib/moodlelib.php
+++ b/lib/moodlelib.php
@@ -8062,6 +8062,16 @@ function component_callback($component, $function, array $params = array(), $def
 
     $functionname = component_callback_exists($component, $function);
 
+    if ($params && (array_keys($params) !== range(0, count($params) - 1))) {
+        // PHP 8 allows to have associative arrays in the call_user_func_array() parameters but
+        // PHP 7 does not. Using associative arrays can result in different behavior in different PHP versions.
+        // See https://php.watch/versions/8.0/named-parameters#named-params-call_user_func_array
+        // This check can be removed when minimum PHP version for Moodle is raised to 8.
+        debugging('Parameters array can not be an associative array while Moodle supports both PHP 7 and PHP 8.',
+            DEBUG_DEVELOPER);
+        $params = array_values($params);
+    }
+
     if ($functionname) {
         // Function exists, so just return function result.
         $ret = call_user_func_array($functionname, $params);