The array number is not changing when I click on each shirt

<?php include("inc/products.php"); ?><?php
$pageTitle = "Mike's Full Catelog of Shirts";
$section = "shirts";
include('inc/header.php'); ?>

    <div class="section shirts page">

        <div class="wrapper">

          <h1>Mikes Full catelog of Shirts  </h1>

          <ul class="products">
            <?php foreach($products as $product_id =>  $product) {
                    echo "<li>";
                    echo '<a href="shirt.php?id=' . $product_id . '">';
                    echo '<img src="' . $product["img"] . '" alt="' . $product["name"] . '">';
                    echo "<p>View Details</p>";
                    echo "</a>";
                    echo "</li>";
                }
            ?>
          </ul>

        </div>
    </div>

<?php include('inc/footer.php'); ?>