php - 如何在 PHP 中从 00000 开始增加数字？

Question

我想将数字从 00000 增加到 99999。我尝试过，但不起作用。下面是我的代码:

    $result=mysql_query("select rid from regid") or die (mysql_error("No Record Found"));
            while($row=mysql_fetch_array($result))
            {
                extract($row);

                $sub=substr("$rid",15);  //It is substring 00000 coming from database. 

            $n2 = str_pad($sub + 1, 5, 0, STR_PAD_LEFT);  // It is code line.
        echo $n2;
        }

Answer 1

添加增量如下

 $i = 0;
     while($row=mysql_fetch_array($result))
                {
                    extract($row);

                    $sub=substr("$rid",15);  //It is substring 00000 coming from database. 

                $n2 = str_pad($sub + $i, 5, 0, STR_PAD_LEFT);  // It is code line.
            echo $n2;
   $i++;
                }