In order to see phpinfo page for the server where your account is located, please login into your File Manager and create file phpinfo.php in your public_html folder.
You should add the following code to your newly created phpinfo.php file:
<?php // Show all information, defaults to INFO_ALL phpinfo(); ?>
Afterward, please Save and close the file. Go to your domain.com/phpinfo.php file and you will see all the PHP limitations! :)