<?php
defined('C5_EXECUTE') or die("Access Denied.");
$cArray = $pl->get($itemsToGet = 100, $offset = 0);
 
function callback($buffer){
  preg_match('/(http:\/\/){0,1}[A-Za-z.\/0-9-%_,]+[.]{1}[A-Za-z]+/', $buffer, $matches);
  $imgUrl=$matches[0];
  return "<img src='{$imgUrl}' />";
  // Here, I would like to output a thumbnail instead
}
?>
<ul id="inventoryList">
   <?php 
   $isFirst = true; //So first item in list can have a different css class (e.g. no top border)
   $excerptBlocks = ($controller->truncateSummaries ? 1 : null); //1 is the number of blocks to include in the excerpt
   $truncateChars = ($controller->truncateSummaries ? $controller->truncateChars : 20);
 
   foreach ($cArray as $cobj):
      if((!$_GET['tagLimit'] || stripos($cobj->getAttribute('tags'), $_GET['tagLimit'])!==false)){
         $title = $cobj->getCollectionName();
         $link = $nh->getLinkToCollection($cobj);
      ?>
         <li class="inventoryItem">
            <h3><a href="<?php echo $link; ?>"><?php echo $title; ?></a></h3>
            <a href="<?php echo $link; ?>">
            <?php 
            $a = new Area('Main Image');
            $a->disableControls();
            $a->setBlockLimit(1);
            ob_start("callback");
               $a->display($cobj);
            ob_end_flush();
 
            ?>
            </a>
         </li>
 
 
   <?php
      }
   endforeach; ?>
</ul>