Define Grid Based on Multiple Item Counts - php

Question

Looking to solve a problem I'm having dynamically defining classes using WordPress Advanced Custom Fields' Repeater field. I've done some digging but haven't been able to find a resource with the specificity that I'm looking for.
I'm displaying a series of portfolio images, and depending on how many there are I would like to give certain photos specific class names within the Foundation grid. Essentially I'm looking to do the following:
For items 1-4: Apply a class of large-6
For items 5+: Apply a class of large-4
If only 1 item: Apply a class of large-8
I've been able to get the first two examples to work, but I'm having trouble defining a third set of parameters. I've tried a number of different routes but I'm not sure what's best at this point. See below for a mockup of what I am looking to accomplish, as well as my code example.
Appreciate any advice!
<div class="row portfolio-examples">
<?php
if( have_rows('portfolio_examples') ):
while ( have_rows('portfolio_examples') ) : the_row();
$count = 0;
$work = get_sub_field('portfolio_work');
?>
<?php if ($count != 0 || $count < 4) :?>
<div class="large-6 medium-6 columns end">
<?php if( $work ): ?>
<img src="<?php echo $work['url']; ?>" alt="<?php echo $work['alt'] ?>" />
<?php endif; ?>
</div>
<?php else: ?>
<div class="large-8 medium-8 large-centered medium-centered columns">
<?php if( $work ): ?>
<img src="<?php echo $work['url']; ?>" alt="<?php echo $work['alt'] ?>" />
<?php endif; ?>
</div>
<?php endif; ?>
<?php
$counter++;
endwhile;
endif;
?>
</div>

Answer 1

Your question is not clear enough to me because you say Apply a class of large or Apply a class of small, but then in your code you use .large-6 and also .large-8.
Anyway, supposing what you're trying to achieve (given your image), your PHP code should be something like this:
<div class="row portfolio-examples">
<?php
if (have_rows('portfolio_examples')) :
/* We need to know the total number
* of rows in your repeater since you have
* a case where there's only one item.
*/
$portfolio = get_field('portfolio_examples');
$count = is_array($portfolio) ? count($portfolio) : 0;
$index = 0;
while (have_rows('portfolio_examples')) : the_row();
if ($count == 1) :
/* Place here your code for when
* there's only 1 item in your portfolio.
*/
?>
<div class="medium"><!-- Medium item --></div>
<?php
elseif ($count > 1 && $index <= 3) :
// Code for your first 4 items
?>
<div class="large"><!-- Large item --></div>
<?php
elseif ($count > 1 && $index > 3) :
// Code for your 5+ items
?>
<div class="small"><!-- Small item --></div>
<?php
else :
// There are no items in your portfolio.
endif;
$index++;
endwhile;
endif;
?>
</div>
Notice: You were reseting to 0 your iterator index ($count in your case) in every iteration. Also, you were incrementing $counter (not $count) which wasn't defined.