Replace Illuminate\Support\Arr with native PHP array functoin calls

Problem/Motivation

In 4 classes, we're currently using methods from Laravel's Illuminate\Support\Arr utility. That's why we have the dependency on illuminate/support which in itself is a massive package, and it comes with a fairly long list of additional dependencies. That's a lot of unnecessary code.

Proposed resolution

Replace those utility methods with native PHP array function calls.