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А кто может подсказать, почему при внесении изменения в код меню сайт ложится в ошибку 504?

<div id="menu">
    <?php foreach ($categories as $category) { ?>
    <li><?php if ($category['active']) { ?>
	<a href="<?php echo $category['href']; ?>" class="active"><?php echo $category['name']; ?></a>
	<?php } else { ?>
	<a href="<?php echo $category['href']; ?>"><?php echo $category['name']; ?></a>
	<?php } ?>
      <?php if ($category['children']) { ?>
        <?php for ($i = 0; $i < count($category['children']);) { ?>
          <?php $j = $i + ceil(count($category['children']) / $category['column']); ?>
          <?php for (; $i < $j; $i++) { ?>
          <?php if (isset($category['children'][$i])) { ?>
          <li><a href="<?php echo $category['children'][$i]['href']; ?>"><?php echo $category['children'][$i]['name']; ?></a></li>
          <?php } ?>
          <?php } ?>
        <?php } ?>
      <?php } ?>
    <?php } ?>

Меня интересует именно часть

$j = $i + ceil(count($category['children']) / $category['column']);

если переменной присваивать другие значения, то...

Вот сейчас выводит по 4 пункта в каждом из 5 столбиков. А я (с учётом субкатегорий) хочу выводить в одном столбике 3, в другом 5...

С чем связана эта проблема?

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