Laravel/Lumen: load SQLite database relative path dynamically. Basically it check if database path IS NOT absolute, then reassign it with relative one.

app.php

<?php // bootstrap/app.php

// <=========== AFTER DOTENV LOEADED ================>

// Laravel/Lumen SQLite relative path
if ((getenv('DB_CONNECTION') === 'sqlite') // Check if BD driver is SQLite
    && (realpath(getenv('DB_DATABASE')) === false) // And database path IS NOT absolute
    ) { // Assign it to absolute with realpath() instead.
    putenv("DB_DATABASE=".realpath(__DIR__.'/../' . getenv('DB_DATABASE')));
};

// <========= BEFORE APPLICATION DEFINED ============>

example.env

# This is the example .env file

APP_ENV=local
APP_DEBUG=true
APP_KEY=
APP_TIMEZONE=UTC

DB_CONNECTION=sqlite
DB_DATABASE=storage/laravel.sqlite3

CACHE_DRIVER=file
QUEUE_DRIVER=sync

Tested on Laravel/Lumen 5.6. I might want to put README.md or just this comment section is fine too.

If you find this useful, you can help other by post the Laravel/Lumen version you tested/using on this comment section.

Feedback are welcome!