如何在表中使用modulo?

How to use modulo in PHP tables?

<table border="1">
<?php for ($i = 1; $i <= 20; $i++): ?>
    <?php if ($i % 5 == 0): ?>
        <tr>
    <?php endif ?>  
        <td><?php echo $i ?></td>
    <?php if ($i % 5 == 0): ?>
        </tr>
    <?php endif ?>  
<?php endfor ?>
</table>

This example show me:

1   2   3   4
5
6   7   8   9
10
11  12  13  14
15
16  17  18  19
20

I would like receive:

1   2   3   4   5
6   7   8   9   10
11  12  13  14  15
16  17  18  19  20

What I must use in if?

let's look at what you are doing: you start a row when $i is a multiple of five and you end a row when $i is a multiple of five. in any other case, you just print the number. so your row can only contain the value 5.

but: you want a row containing 1,2,3,4,5 - so you have to finish the row after 5, what you are doing, but start it before 1.

<table border="1">
<?php for ($i = 1; $i <= 20; $i++): ?>
    <?php if ($i % 5 == 1): ?>
        <tr>
    <?php endif ?>  
        <td><?php echo $i ?></td>
    <?php if ($i % 5 == 0): ?>
        </tr>
    <?php endif ?>  
<?php endfor ?>
</table>