Additional information regarding this issue for Namecheap VPS hosting: in WHM, go to the left side panel -> MultoPHP Manager -> User Domain Settings -> PHP-FPM Settings. Delete all of the offending functions by clicking the "x" on each of them ( shell_exec, eval, assert, phpinfo, and the rest). Save the settings. 

Now, on the left side panel -> Restart Services -> PHP-FPM service for Apache -> restart. Then also restart HTTP Server (Apache). 

Reload your UNI page.

The issue is that on some hosts, the PHP.ini stuff is held in a different area (like the others have explained). It's weird, but just go with the flow.