Question

我想将数字从00000增加到99999.我试过了，但它没有用。以下是我的代码：

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

按如下方式添加增量

 $i = 0;
     while($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++;
                }

Answer 2

只需添加另一个循环，将i +1增加到99999。

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

            $sub=substr("$rid",15);  //It is substring 00000 coming from database. 
        }
$i = 0;
while ($i<100000)
{
  $n2 = str_pad($sub + $i, 5, 0, STR_PAD_LEFT);  
        echo $n2;
$i++;
}

Answer 3

我希望这会对你有所帮助

$number = str_pad($i, 5, '0', STR_PAD_LEFT);

演示：https://3v4l.org/aYZUk

Answer 4

数据库可以直接为您使用 zerofill 。如果您创建这样的表（或更改自己的表）。使用int的长度，您可以说出您想要多少位数：

MariaDB [YourSchema]> show create table yourCount;
+-----------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table     | Create Table                                                                                                                                                                                        |
+-----------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| yourCount | CREATE TABLE `yourCount` (
  `id` int(6) unsigned zerofill NOT NULL AUTO_INCREMENT,
  `myDate` varchar(16) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8 |
+-----------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)

MariaDB [YourSchema]>

示例 - 显示数据

MariaDB [YourSchema]> select * from yourCount;
+--------+--------+
| id     | myDate |
+--------+--------+
| 000001 | data1  |
| 000002 | data2  |
| 000003 | data3  |
+--------+--------+
3 rows in set (0.00 sec)

插入不计数的新行

MariaDB [YourSchema]> insert into yourCount (myDate) VALUES ('data4');
Query OK, 1 row affected (0.06 sec)


MariaDB [YourSchema]> select * from yourCount;
+--------+--------+
| id     | myDate |
+--------+--------+
| 000001 | data1  |
| 000002 | data2  |
| 000003 | data3  |
| 000004 | data4  |
+--------+--------+
4 rows in set (0.00 sec)

添加ID为

的行

MariaDB [YourSchema]> insert into yourCount (id,myDate) VALUES (5,'data4');
Query OK, 1 row affected (0.06 sec)

MariaDB [YourSchema]> select * from yourCount;
+--------+--------+
| id     | myDate |
+--------+--------+
| 000001 | data1  |
| 000002 | data2  |
| 000003 | data3  |
| 000004 | data4  |
| 000005 | data4  |
+--------+--------+
5 rows in set (0.00 sec)

如何在PHP中增加00000的数字？

4 个答案: