Parse error for details page

Hey guys! Looks like I typed the code exactly as Alena had it in the video, however I am getting this error trying to display the page in a browser:

Parse error: syntax error, unexpected '?> ' in /home/treehouse/workspace/details.php on line 55

Here's the code I have:

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

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

if (!isset($item)) { header("location:catalog.php"); exit; } $pageTitle = $item["title"]; $section = null; include("inc/header.php"); ?>

<div class="section page">

<div class="wrapper"> <div class="media-picture"> <span> <img src="<?php echo $item["img"]; ?>" alt="<?php echo $item["title"]; ?>" /> </span> </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 $item["year"]; ?></td>
    </tr>
    <?php
    if (strtolower($item["category"] == "books"){ 
    ?>
      <tr>
      <th>Authors</th>
      <td><?php echo $item["authors"]; ?></td>
    </tr>
    <tr>
      <th>Publisher</th>
      <td><?php echo $item["publisher"]; ?></td>
    </tr>
    <tr>
      <th>ISBN</th>
      <td><?php echo $item["isbn"]; ?></td>
    </tr>

    <?php } ?>
  </table>
</div>

</div> </div> '''