带有引导列的PHP计数逻辑

Question

I want to count the custom fields and give the columns the right width to work with Bootstrap 3.

If there are 2 entries I want it to be:

<div class="col-md-6">

If there are 3 entries I want it to be:

<div class="col-md-4">

But it just puts the count number in each div.

EDIT: The solution of "num8er" helped me a lot, THX again! If someone finds this - this is how it works with a normal wordpress loop:

<?php 
if ( have_posts() ): ?> 

<?php $elements = []; 
while ( have_posts() ): the_post(); 
$element = get_the_title(); 
$elements[] = $element;
endwhile; 

if(sizeof($elements)>0) {
    $size = ceil(12 / sizeof($elements));
    if($columns<2) $columns = 2;
        foreach($elements AS $element) {
              echo '<div class="col-md-'.$size.'">'.$element.'</div>';
        }
    }

endif; 
?>

E. g. this is the DOM if i have 6 articles:

<div class="col-md-2"><h2>Homer Simpson’s  Guide  to  Tom Cruise</h2></div>
<div class="col-md-2"><h2>Homer Simpson’s  Guide  to  Tom Cruise</h2></div> 
...

Answer 1

let's collect the output to array $elements and get the size of column and wrap with it:

<?php if( have_rows('buehne_inhalt', 'option') ): ?>

  <h2><?=the_sub_field('subline')?></h2>
  <div class="row">
  <$php 
  $elements = []; 
  while( have_rows('buehne_inhalt', 'option') ): the_row();
    $image = get_sub_field('buehne_bild');
    $size = 'img-s';
    if( $image ) {
        $element = wp_get_attachment_image( $image, $size );
    }

    $elements[] = $element;
  endwhile; 

  if(sizeof($elements)>0) {
    $size = ceil(12 / sizeof($elements));
    if($columns<2) $columns = 2;

    foreach($elements AS $element) {
      echo '<div class="col-md-'.$size.'">'.$element.'</div>';
    }
  }
  ?>
</div>
<?php endif; ?>