Laravel package migration filename

/**
 * This is a function that helps naming migrations published by packages
 * it will generate YYYY_mm_dd_######_migration_name.php
 * if the migration has already been published, it will return the published migration name to prevent dupplicate
 * 
 * @param  \Illuminate\Filesystem\Filesystem  $filesystem
 * @param $migrationName the migration file base name without timestamp or .stub e.g. create_user_table.php
 * @param $i allows for incrementing in a way that the migrations order is kept
 *
 * @return string
 */
private function getMigrationFileName(Filesystem $filesystem, $migrationName, $i): string
    {
        $pad = str_pad($i, 6, '0', STR_PAD_LEFT);
        $timestamp = date('Y_m_d').'_'.$pad;

        return Collection::make($this->app->databasePath().DIRECTORY_SEPARATOR.'migrations'.DIRECTORY_SEPARATOR)
                         ->flatMap(function ($path) use ($filesystem, $migrationName) {
                             return $filesystem->glob($path."*_{$migrationName}.php");
                         })
                         ->push($this->app->databasePath()."/migrations/{$timestamp}_{$migrationName}.php")
                         ->first();
    }