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Laravel's Dependency Injection Container in Depth

Laravel has a powerful Inversion of Control (IoC) / Dependency Injection (DI) Container. Unfortunately the official documentation doesn't cover all of the available functionality, so I decided to experiment with it and document it for myself. The following is based on Laravel 5.4.26 - other versions may vary.

Introduction to Dependency Injection

I won't attempt to explain the principles behind DI / IoC here - if you're not familiar with them you might want to read What is Dependency Injection? by Fabien Potencier (creator of the Symfony framework).

Accessing the Container

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<?php

/**
 * Query builder scope to list neighboring locations 
 * within a given distance from a given location
 *
 * @param  Illuminate\Database\Query\Builder  $query  Query builder instance
 * @param  mixed                              $lat    Lattitude of given location
 * @param  mixed                              $lng    Longitude of given location
 * @param  integer                            $radius Optional distance