I've just loaded zc157d running PHP 5.6.40 with no issues, so there might be something 'funky' either with either your Zen Cart setup or your webhost's environment.
You can create a teeny file named (something_obtuse.php) that contains
Upload that to the root of your site and run it to see the base PHP setup for your site. At the very top, the function will identify the full PHP version/subversion as well as some of the basic PHP configuration information.Code:<?php phpinfo();
If you would, capture that information and post back. It would also help to see the contents of the admin version of the configure.php file (no need to include the database connection information).
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