Laravel database backup migration

gistfile1.php

class BackupOldTables extends Migration
{

    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        // Postfix every table with '_bck'
        $tables = $this->listTables();
        foreach ($tables as $table) {
            if ($table === 'migrations') {
                continue;
            }
            Schema::rename($table, $table . '_bck');
        }
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        // Delete tables without postfix, then delete postfixes themselves.
        $tables = $this->listTables();
        $pattern = '/_bck$/';

        foreach ($tables as $table) {
            if (! preg_match($pattern, $table)) {
                Schema::drop($table);
            }
        }

        foreach ($tables as $table) {
            if (preg_match($pattern, $table)) {
                $table_new = preg_replace($pattern, '', $table);
                Schema::rename($table, $table_new);
            }
        }
    }

    /**
     * Make array from table names, dispose of prefixes.
     *
     * @return mixed
     */
    public function listTables()
    {
        $tables = \DB::select('SHOW TABLES');

        foreach ($tables as $key => $table) {
            $table_tmp = array_shift($table);
            $table_tmp = preg_replace('/^brd_/', '', $table_tmp);

            // Don't touch migrations.
            if ($table_tmp === 'migrations'){
                unset($tables[$key]);
            } else{
                $tables[$key] = $table_tmp;
            }
        }

        return $tables;
    }
}