每13个li元素后创建新的ul

Question

First of all, I don't know how to count in php, maybe someone could recommend me a good source to read;

Second, I'm not asking to solve this for me, but I just want a hint or simpler explanation that would make sense;

Here is my function:

  <ul>
    <?php foreach ($categories as $category) { ?>
    <li>
    <a href="<?php echo $category['href']; ?>"><p><?php echo $category['name']; ?></p></a>
      <?php if ($category['children']) { ?>
      <div>
        <?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])) { ?>
        <ul>      
          <li class="none"><h1><?php echo $category['children'][$i]['name']; ?></h1></li>
        <?php if ($category['children'][$i]['children_level2']) { ?>     
        <?php for ($wi = 0; $wi < count($category['children'][$i]['children_level2']); $wi++) { ?>
           <li> 
          <a href="<?php echo $category['children'][$i]['children_level2'][$wi]['href']; ?>"><?php echo $category['children'][$i]['children_level2'][$wi]['name']; ?></a>
           </li>
         <?php } ?>
         <?php } ?>         
        </ul>
        <?php } ?>
        <?php } ?>
        <?php } ?>
      </div>
      <?php } ?>
    </li>
    <?php } ?>
  </ul> 

I want this part, every 13 li elements to create a new .ul. ./ul. tags

<?php if (isset($category['children'][$i])) { ?>
   <ul>      
      <li class="none"><h1><?php echo $category['children'][$i]['name']; ?></h1></li>
        <?php if ($category['children'][$i]['children_level2']) { ?>     
        <?php for ($wi = 0; $wi < count($category['children'][$i]['children_level2']); $wi++) { ?>
          <li> 
          <a href="<?php echo $category['children'][$i]['children_level2'][$wi]['href']; ?>"><?php echo $category['children'][$i]['children_level2'][$wi]['name']; ?></a>
       </li>
         <?php } ?>
         <?php } ?>         
    </ul>

  <ul><li>maximum of 13 elements</li></ul>
after 13 <li></li> elements create new <ul></ul> tags and put the 14 <li></li> element into the new <ul></ul> tag

I hope I explained what I want to do, for now I'll be waiting for your answers,

p.s. this is more for my learning skills then actual work, so thanks in advice

Answer 1

It's simple. Use condition

if ($wi && $wi % 13 == 0) {
    print '</ul><ul>';
}