SquadMaps-PHP is a curated list of all available Squad maps as well formed strings, ready to be used in your MapRotation.cfg.
You can install SquadMaps-PHP with composer by using the following command.
composer require skyraptor/squad-maps-php
Simply use it like in the following example:
use SquadMaps\SquadMaps;
/** @var array */
$maps = SquadMaps::getMaps();