Как правильно вычислить последовательность для вывода?

Question

[Максим]

Всем привет

как вывести вот в такой структуре,

<div>
   <div class="double items">
      <div>1</div>
      <div>2</div>
   </div>
   <div>3</div>
<div>
<div>
   <div class="double items">
      <div>4</div>
      <div>5</div>
   </div>
   <div>6</div>
<div>
<div>
   <div class="double items">
      <div>7</div>
      <div>8</div>
   </div>
   <div>9</div>
<div>

$idx начинается с 1

{if $idx == 1 ||  $idx % 4 == 1}
    <div class="ascents-section">
{/if}
    {if $idx % 3 != 1}
         <div class="ascents-section__item ascents-double">
    {/if}
        <div class="ascents-double__item" title="{$id | resource: 'pagetitle'}">
              <div class="ascents-section__item-photo" id="photo-effect">
                <picture>
                  <source media="(min-width: 1440px)" srcset="{$id | resource:'image'}">
                  <img class="effectImg" src="{$id | resource:'image'}" alt="{$id | resource: 'pagetitle'}">
                </picture>
              </div>
              <div class="ascents-section__item-info">
                <h2 class="for-heading">{$id | resource: 'pagetitle'}</h2>
                <p class="subtitle">Легкий</p>
                <a href="{$_modx->makeUrl($id)}" title="{$id | resource: 'pagetitle'}" class="button button-program">Перейти</a>
              </div>
            </div>
    {if $idx % 3 == 1}
        </div>
    {/if}
    {if $idx % 3 == 1}
        <div class="ascents-section__item" title="{$id | resource: 'pagetitle'}">
            <div class="ascents-section__item-photo" id="photo-effect">
              <picture>
                <source media="(min-width: 1440px)" srcset="{$id | resource:'image'}">
                <img class="effectImg" src="{$id | resource:'image'}" alt="{$id | resource: 'pagetitle'}">
              </picture>
            </div>
            <div class="ascents-section__item-info">
              <h2 class="for-heading">{$id | resource: 'pagetitle'}</h2>
              <p class="subtitle">Тяжелый</p>
              <a href="{$_modx->makeUrl($id)}" title="{$id | resource: 'pagetitle'}" class="button button-program">Перейти</a>
            </div>
        </div>
    {/if}
{if $idx % 3 == 1}
    </div>
{/if}

Answer 1

[Сергей delphinpro]

Псевдокод:

$chunks = array_chunk($inputArray, 3);

foreach($chunks as $chunk) {
  <div>
    <div class="double items">
      <div> echo $chunk[0] </div>
      if (count($chunk) > 1) {
        <div> echo $chunk[1] </div>
      }
    </div>
    if (count($chunk) > 2) {
      <div> echo $chunk[2] </div>
    }
  <div>
}