codeigniter sql 備份在本地服務器中工作正常，但在實時顯示錯誤

Question

遇到 PHP 錯誤嚴重性：通知

消息：只能通過引用分配變量

**這是我的 controller 代碼**

public function data_backup()
{
    $this->load->dbutil();
    $prefs = array('format' => 'zip','filename' => 'nirmithi.sql');
    $backup =& $this->dbutil->backup($prefs); 
    $db_name = 'backup-on-'. date("Y-m-d-H-i-s") .'.zip';
    $save = 'Backup/'.$db_name;
    $this->load->helper('file');
    write_file($save, $backup); 
    $this->load->helper('download');
    force_download($db_name, $backup);
}

Answer 1

去掉 & 在這一行試試

$backup = $this->dbutil->backup($prefs);