Tell me how to limit the output of elements in php

In a for-cycle, you should correct the condition for completing the cycle by adding the condition $i < 5

 for ($i=0; $i < sizeof($tags) && $i < 5; $i++) { ... } 

Or modify the K2ModelItem::getItemTags() method so that it would accept an optional optional parameter restricting the selection.

 function getItemTags($id, $limit = null) { ... } 

Then it will be possible to limit any number of elements.

 $tags = K2ModelItem::getItemTags($item->id, 5); 

Then in the foreach loop, add the output for the same condition.

  <?php $counter = 0; ?> <?php foreach ($item->tags as $tag): ?> <?php if (++$counter > 5) break; ?> <li><a href="<?php echo $tag->link; ?>"><?php echo $tag->name; ?></a></li> <?php endforeach; ?>