从sql文件php恢复数据库备份

Question

我想将备份文件复制到我的数据库然后恢复它。 我可以创建备份文件，但我无法恢复它我不知道为什么 这是恢复代码

$file=$_GET['restore'];
//  echo($file);
//echo $file;
        $tableNames = "";
        $fileRollback = file_get_contents($file);
 $rollBackQuery = explode("\n\n\n", $fileRollback);
  echo $fileRollback;
//echo $fileRollback;
//  $res = $con2->query($fileRollback);

$result = mysqli_multi_query($con2, $fileRollback);//or 
die(mysqli_error($con2));  
if($result)
    echo('<div class="alert-box success"><span>Success: </span>backup file 
 successfully restored.</div>');
else    echo('<div class="alert-box error"><span>error: </span>Faild restore 
backup file .</div>');