Laravel Command used for creating database.

DatabaseCreateCommand.php

<?php

namespace App\Console\Commands;


use PDO;
use PDOException;
use Illuminate\Console\Command;


class DatabaseCreateCommand extends Command
{
    /**
     * The console command name.
     *
     * @var string
     */
    protected $name = 'db:create';
    /**
     * The console command description.
     *
     * @var string
     */
    protected $description = 'This command creates a new database';
    /**
     * The console command signature.
     *
     * @var string
     */
    protected $signature = 'db:create';
    /**
     * Execute the console command.
     */
    public function handle()
    {
        $database = env('DB_DATABASE', false);
        if (! $database) {
            $this->info('Skipping creation of database as env(DB_DATABASE) is empty');
            return;
        }
        try {
            $pdo = $this->getPDOConnection(env('DB_HOST'), env('DB_PORT'), env('DB_USERNAME'), env('DB_PASSWORD'));
            $pdo->exec(
                sprintf(
                    'CREATE DATABASE IF NOT EXISTS %s CHARACTER SET %s COLLATE %s;',
                    $database,
                    config('database.connections.mysql.charset'),
                    config('database.connections.mysql.collation')
                )
            ) or die(print_r($pdo->errorInfo(), true));
            
            $this->info(sprintf('Successfully created %s database', $database));
            
        } catch (PDOException $exception) {
            $this->error(sprintf('Failed to create %s database, %s', $database, $exception->getMessage()));
        }
    }
    /**
     * @param  string $host
     * @param  integer $port
     * @param  string $username
     * @param  string $password
     * @return PDO
     */
    private function getPDOConnection($host, $port, $username, $password)
    {
        return new PDO(sprintf('mysql:host=%s;port=%d;', $host, $port), $username, $password);
    }
}

Place file at app/Console/Commands/ inside of your project.

Additionally, a command could be ran automatically with composer, for example, on composer install post-install event:

 "post-install-cmd": [
            "@php artisan ui bootstrap --auth",
            "@php artisan db:create"
        ],

Other events: https://getcomposer.org/doc/articles/scripts.md#command-events