Because every system is setup differently, PHP provides a function called phpinfo() that makes possible to explore the configuration settings for debugging purposes. It’s important to be aware of your PHP configuration when you are troubleshooting a problem in AtoM.
All you have to do is to create a new file with the contents shown below and put it in a web viewable location, then open that location from your browser. You could also add the function (found in the third line) to the very end of the qubit_dev.php file.
<?php phpinfo(); ?>
You can find more help on the following link: How can I create a phpinfo.php page? (mediatemple.net).