How to make more columns in a while

PHP
1

I have this code

while ($row = mysqli_fetch_array ($r, MYSQLI_ASSOC)) {
            
            echo "
            <div><h4><a href=\"page.php?id={$row['subcategory_id']}\">{$row['subcategory']}</a></h4>
            </div>\n";
            
        }

With this while I put on a page a vertical line with subcategories. For ex:
foo
foo
foo
foo
foo
foo
foo

I want to limit those subcategories to 10 and after each 10 to start from the top again, like this:

foo foo foo
foo foo foo
foo foo foo
foo foo foo
foo foo foo
foo foo foo
foo foo foo

Can someone tell how to do that?

2

At least an idea, or a different way to do this?

3

Play around with this script:

$iCol = 0;
for($i2=0; $i2<42; $i2++) {

  if( $iCol++ % 3 === 0) {
    echo '<br />';
  }
  echo $i2, ', &nbsp;&nbsp;';

}

Output:

4

I was intrigued as to how to display vertically so…

  $cols = [];
  for($i2=0; $i2< 42; $i2++) {
    $cols[] = $i2;
  }

  $iMax = 10;
    for( $i2 = 0; $i2 < $iMax; $i2++){
      echo $cols[$i2+00] .', &nbsp; ';
      echo $cols[$i2+10] .', &nbsp; ';
      echo $cols[$i2+20] .', &nbsp; ';
      echo $cols[$i2+30] .', &nbsp; ';
      echo '<br />';
    }

Output:

5

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