bedezign\yii2\audit\AuditTrailBehavior::saveAuditTrail PHP Method

    protected function saveAuditTrail($action, $newAttributes, $oldAttributes, $entry_id, $user_id, $model, $model_id, $created)
    {
        // Build a list of fields to log
        $rows = array();
        foreach ($newAttributes as $field => $new) {
            $old = isset($oldAttributes[$field]) ? $oldAttributes[$field] : '';
            // If they are not the same lets write an audit log
            if ($new != $old) {
                $rows[] = [$entry_id, $user_id, $old, $new, $action, $model, $model_id, $field, $created];
            }
        }
        // Record the field changes with a batch insert
        if (!empty($rows)) {
            $columns = ['entry_id', 'user_id', 'old_value', 'new_value', 'action', 'model', 'model_id', 'field', 'created'];
            $audit = Audit::getInstance();
            $audit->getDb()->createCommand()->batchInsert(AuditTrail::tableName(), $columns, $rows)->execute();
        }
    }