in the php.ini file for your testing server, you will need to disable the deprecated error level.
to find where the php.ini file is located, create a new file yin your site named phptest.php and add the following code:
<?php phpinfo(); ?>
then view that page in the browser, look for the Loaded Configuration File, this will give the path to the php.ini file, in that file, find the error_reporting setting, and set it to:
error_reporting = E_ALL & ~E_DEPRECATED
you will need to restart the server after making the change.