1. Move the craftplugindevhelpers directory into your craft/plugins directory.
2. Go to Settings > Plugins from your Craft control panel and enable the craftPluginDevHelpers plugin

Die and Dump. Via Taylor Otwell, the man, the mystery, the legend.

Die and Dump, using Craft::dump()

Wrap getenv() with Laravel's env() helper, which converts boolean strings to real booleans and takes an optional second parameter that is the default. E.g.

$shouldDoThing = env('SHOULD_DO_THING', false);