Maintenance::index PHP Method

    public function index()
    {
        $this->load->helper('number');
        $this->user->restrict('Admin.Maintenance.Access');
        if ($this->input->post('migrate') and $this->_migrate() === TRUE) {
            redirect('maintenance');
        }
        if ($this->Maintenance_model->checkTables($this->input->post('tables'))) {
            $this->session->set_flashdata('tables', $this->input->post('tables'));
            redirect('maintenance/backup');
        }
        $this->template->setTitle($this->lang->line('text_title'));
        $this->template->setHeading($this->lang->line('text_heading'));
        $this->template->setButton($this->lang->line('button_backup'), array('class' => 'btn btn-primary', 'onclick' => '$(\'#tables-form\').submit();'));
        $this->template->setButton($this->lang->line('button_migrate'), array('class' => 'btn btn-success', 'onclick' => '$(\'#migrate-form\').submit();'));
        $data['backup_tables'] = FALSE;
        $data['db_tables'] = array();
        $db_tables = $this->Maintenance_model->getdbTables();
        foreach ($db_tables as $db_table) {
            $data['db_tables'][] = array('name' => $db_table['table_name'], 'records' => $db_table['table_rows'], 'data_length' => byte_format($db_table['data_length']), 'index_length' => byte_format($db_table['index_length']), 'data_free' => byte_format($db_table['data_free']), 'engine' => $db_table['engine'], 'browse' => site_url('maintenance/browse_table/' . $db_table['table_name']));
        }
        $data['backup_files'] = $this->Maintenance_model->getBackupFiles();
        $migrate_type = 'core';
        $this->load->library('migration');
        $data['installed_version'] = $this->migration->get_version($migrate_type);
        $data['latest_version'] = (int) $this->migration->get_latest_version($migrate_type);
        $data['migration_files'] = array();
        if ($migration_files = $this->migration->find_migrations($migrate_type)) {
            foreach ($migration_files as $version => $migration_file) {
                $migration_file = basename($migration_file);
                $version = $this->migration->get_migration_number(basename($migration_file));
                $data['migration_files'][$version] = $migration_file;
            }
        }
        $this->template->render('maintenance', $data);
    }