Doctrine\DBAL\Migrations\Tools\Console\Command\GenerateCommand::generateMigration PHP Method

    protected function generateMigration(Configuration $configuration, InputInterface $input, $version, $up = null, $down = null)
    {
        $placeHolders = ['<namespace>', '<version>', '<up>', '<down>'];
        $replacements = [$configuration->getMigrationsNamespace(), $version, $up ? "        " . implode("\n        ", explode("\n", $up)) : null, $down ? "        " . implode("\n        ", explode("\n", $down)) : null];
        $code = str_replace($placeHolders, $replacements, $this->getTemplate());
        $code = preg_replace('/^ +$/m', '', $code);
        $migrationDirectoryHelper = new MigrationDirectoryHelper($configuration);
        $dir = $migrationDirectoryHelper->getMigrationDirectory();
        $path = $dir . '/Version' . $version . '.php';
        file_put_contents($path, $code);
        if ($editorCmd = $input->getOption('editor-cmd')) {
            proc_open($editorCmd . ' ' . escapeshellarg($path), [], $pipes);
        }
        return $path;
    }