Catalog Page just refreshes when trying to view details.php

Question

Hello,

Whenever I either click a catalog item or writes out the URL manually, the catalog page just refreshes instead of showing me the details of the catalog item.

I think Something is wrong with my functions.php, but can not find it. Here is my functions .php:

<?php

function get_item_html($id,$item) {
  $output = "<li><a href='details.php?id="
        . $id . "'><img src='" 
        . $item["img"] . "' alt='" 
        . $item["title"] . "' />" 
        . "<p>View Details</p>"
        . "</a></li>";
    return $output;

}


function array_category($catalog,$category) {
 $output = array();

  foreach ($catalog as $id => $item) {
    if ($category == null OR strtolower($category) == strtolower($item["category"])) : 
        $sort = $item["title"];
        $sort = ltrim($sort, "The ");
        $sort = ltrim($sort, "A ");
        $sort = ltrim($sort, "An ");
        $output[$id] = $sort; 
    endif;
  }
  asort($output);
  return array_keys($output);
}

And my Details.php

<?php
include("inc/data.php");
include("inc/functions.php");


if (isset($_GET["id"])) {
    $id = $GET["id"];
    if (isset($catalog[$id])) {
      $item = $catalog[$id];
    }
}

if (!isset($item)) {
  header("location:catalog.php");
  exit;
}


$pageTitle = $iten["title"];
$section = null;
include('inc/header.php'); 
?>

<div clas="section page">
  <div class="wrapper">

    <div class="media-picture">
      <span><img src="<?php echo $item["img"]; ?>" alt="<?php echo $item["title"] ?>" /></span>
     </div>

  </div>
  <div class="media-details">
    <h1><?php echo $item["title"] ?></h1>
    <table>
      <tr>
        <th>Category</th>
        <td><?php echo $item["category"]?></td>
      </tr>
      <tr>
        <th>Genre</th>
        <td><?php echo $item["genre"]?></td>
      </tr>
      <tr>
        <th>>Format</th>
        <td><?php echo $item["format"]?></td>
      </tr>
      <tr>
        <th>Year</th>
        <td><?php echo $item["year"]?></td>
      </tr>
    <?php
      if (strolower($item["category"]) == "books") {
    ?>
      <tr>
          <th>Authors</th>
          <td><?php echo implode(", ", $item["authors"]); ?></td>
      </tr>
      <tr>
          <th>Publishers</th>
          <td><?php echo $item["publisher"]; ?></td>
      </tr>
      <tr>
          <th>ISBN</th>
          <td><?php echo $item["isbn"]; ?></td>
      </tr>

     <?php } ?>


    </table>
  </div>
</div>

<?php
  include("footer.php");
  ?>

Thank you.

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Lars Hansen

Lars Hansen

Catalog Page just refreshes when trying to view details.php