Under PHP +7, You may encounter an issue updating Drupal based on the following message:
Multibyte string input conversion in PHP is active and must be disabled. Check the php.ini mbstring.http_input setting. Please refer to the PHP mbstring documentation (http://www.php.net/mbstring) for more information.
The suggested solution for this is to add the following lines:
To the top of your "settings.php" file:
If you have any queries on this, please contact our Support team - see the following for our contact details: