Viewing PHP errors
PHP writes all its errors into a log file which depends on your particular setup. It will typically be called
error.log. It may be a good idea to ask your web host where you can check the contents of this file.
Besides this, it may be easier to have PHP just print out its errors on the screen (web page). This is disabled by default on many systems.
You can enable it in your php.ini file.
You may also enable it in your .htaccess File like this:
Finally, check your _advanced.php configuration file for the following:
If in doubt, make sure this value is true and not overridden in _local.php.