Counting items in a PHP array_chunk - php

Question

I have the below function which gets wordpress posts and outputs them in a bootstrap grid (3 posts per row). Each array chunk has 3 posts in it. Basically what I want to do is if the chunk is not complete and only has say 2 posts in it then the first post in that chunk gets "col-sm-offset-2" class added. I believe I need some way off counting the posts in the chunk but I'm not sure how to implement.
function post_events($atts) {
global $post;
$args = array(
'post_type' => 'event',
'post_status' => 'publish',
'orderby' => 'date',
'order' => 'ASC',
);
$posts = get_posts($args);
$posts_chunks = array_chunk($posts, 3);
$output = '';
foreach ($posts_chunks as $row) {
$output .= '<div class="row">';
foreach ($row as $post) {
setup_postdata($post);
$output .= '<div class="col-md-6 col-sm-6 event-item">';
$output .= '' .get_the_post_thumbnail(). '';
$output .= '<div class="event-item-text">';
$output .= '<h3>' .get_the_title(). '</h3>';
$output .= '<span class="event-date">' .get_the_date("d-m-Y"). '</span>';
$output .= '<p>' .wp_trim_words( get_the_content(), 40, '...' ). '</p>';
$output .= '</div>';
$output .= '</div>';
}
$output .= '</div>';
}
return $output;
}
add_shortcode('post_events','post_events');

Answer 1

You can just use count() on $row, and then set the class based on whether it's the first iteration or not:
$class = 'col-md-6 col-sm-6 event-item';
$count = count($row);
foreach( $row as $k => $post )
{
$cls = ($k == 0 && $count < 2) ? $class.' col-sm-offset-2' : $class;
setup_postdata($post);
$output.= '<div class="'.$cls.'">';
//...
}

Answer 2

Since you have chunked, the subarrays will be 0 based and the first post will be 0. So just check that and if the count is less than 3:
foreach ($posts_chunks as $row) {
$output .= '<div class="row">';
foreach ($row as $key => $post) {
$extra = ''; //set extra class to empty
if($key == 0 && count($row) < 3) { //check first post and count less than 3
$extra = 'col-sm-offset-2 '; //set extra class
}
setup_postdata($post);
//use $extra somewhere
$output .= '<div class="'.$extra.'col-md-6 col-sm-6 event-item">';
$output .= '' .get_the_post_thumbnail(). '';
$output .= '<div class="event-item-text">';
$output .= '<h3>' .get_the_title(). '</h3>';
$output .= '<span class="event-date">' .get_the_date("d-m-Y"). '</span>';
$output .= '<p>' .wp_trim_words( get_the_content(), 40, '...' ). '</p>';
$output .= '</div>';
$output .= '</div>';
}
$output .= '</div>';
}