Change column size based on amount of elements - php

Question

So I'm working on a HTML carousel using Twitter Bootstrap, Wordpress and ACF Fields.
This carousel shows 2 items per row. Each of these items has a class of "col-md-6". So by showing 2 items per row, the total is 2 columns of "col-md-6" (which is perfect since this completes the 12 columns required by Bootstrap):
Here is my code:
<?php if (have_rows('columns_carousel_slide')) {
$count = 0; ?>
<div class="item active"><div class="row">
<?php while(have_rows('columns_carousel_slide')) {
the_row();
if ($count > 0 && (($count % 2) == 0)) {
?>
</div> <!--.item -->
</div> <!--.row -->
<div class="item">
<div class="row">
<?php } ?>
<div class="col-md-6">
<h2><?php the_sub_field('columns_carousel_slide_title'); ?></h2>
</div> <!--.col-md-6 -->
<?php $count++; } ?>
</div> <!--.item -->
</div> <!--.row -->
<?php } ?>
However, I would like to know if there's a way to detect if there's 1 item per row and if so, then show a "col-md-12" instead of a "col-md-6" in order to fill in the remaining space of not having 2 items.
Any ideas are welcome.
Thanks!
--
Edit: As suggested by Jakub, I've updated my code to the following:
<?php if (have_rows('columns_carousel_slide')) {
$count = 0; ?>
<div class="item active"><div class="row">
<?php
$multiplier = 1; //that could actually go before the while
if (count(get_field('columns_carousel_slide'))%2 === 1 &&
$count === count(get_field('columns_carousel_slide'))-1) {
$multiplier = 2;
} ?>
<?php while(have_rows('columns_carousel_slide')) {
the_row();
if ($count > 0 && (($count % 2) == 0)) {
?>
</div> <!--.item -->
</div> <!--.row -->
<div class="item">
<div class="row">
<?php } ?>
<div class="col-md-<?php echo (6*$multiplier);?>">
<h2><?php the_sub_field('columns_carousel_slide_title'); ?></h2>
</div> <!--.col-md-6 -->
<?php $count++; } ?>
</div> <!--.item -->
</div> <!--.row -->
<?php } ?>
However, I think I've must have missed something because I am getting total of "col-md-12" for all the rows.

Answer 1

Assuming that "get_field" returns the array with all rows, then you would need to change the following:
<div class="col-md-6">
<h2><?php the_sub_field('columns_carousel_slide_title'); ?></h2>
</div> <!--.col-md-6 -->
with this:
<?php
$multiplier = 1; //that could actually go before the while
if (count(get_field('columns_carousel_slide'))%2 === 1 &&
$count === count(get_field('columns_carousel_slide'))-1) {
$multiplier = 2;
} ?>
<div class="col-md-<?php echo (6*$multiplier);?>">
<h2><?php the_sub_field('columns_carousel_slide_title'); ?></h2>
</div> <!--.col-md-12 -->
A short explanation:
initially we set the multiplier to 1 (so that 6*1 = 6 for paired
columns).
we do a condition to check if number of items is even
and we are currently processing the last item. If so - we set the
multiplier to 2 (so that 6*2 = 12 for single column)
we set the class to be "col-md-" and the result of our calculation (either 6 or 12)