PHP function for grouping elements in a loop

fn_group_every.php

<?php

/**
 * PHP function for grouping elements in a loop
 * @param int $times Group max items
 * @param array $items
 * @param string $html_before Group start html
 * @param string $html_after Group close html
 * @param string $fn Callable function name that generates the item HTML
 * @param int $offset
 * @param int $limit
 * @return string The generated HTML (all groups)
 */
function group_every($times, $items, $html_before, $html_after, $fn, $offset=0, $limit = null){
    $cursor = $cursor2 = $offset;
    $last = !empty($limit) ? $limit : count($items);
    $last-=1;
    $html = "";
    
    while($cursor <= $last){
        echo $html_before;
        for($i = $cursor; $i < ($cursor + $times); $i++){
            $cursor2 = $i;
            if($cursor2 > $last) break;
            $html .= call_user_func($fn, $i, $items[$i]);
        }
        $cursor = $cursor2+1;
        echo $html_after;
    }
    return $html;
}

Example:

<?php
        echo group_every(4, $images, '<div class="filmstrip-row">', '</div>', 'tpl_filmstrip_row_item');
?>