Hello Brendon,
To determine what version of PHP you are running, you can simply create a phpinfo.php page inside of your website’s home directory. Once you create that file, add the following text/code to the file and save it:
<? phpinfo(); ?>
Then you can visit yourwebsite.com/phpinfo.php (replacing yourwebsite.com with your actual website’s domain) to view the PHP settings, including the version you are running.
As far as changing it, that depends on the server environment you are hosting your site on. You may need to contact your host to determine how to update PHP in your environment.
BoldGrid is a plugin that runs within the WordPress environment, so there is no way to run BoldGrid without WordPress.
I hope this helps! Let us know if you have any further questions or concerns.
Sincerely,
Carlos E