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PHP Enhancing a Simple PHP Application Adding Search: Controller & View Escaping Output Review

code challenge Adding Search: Controller and View - how do I display the search term?

I tried the following code, but it doesn't work:

value = "<?php if (isset($search_term)) { echo htmlspecialchars($search_term); } ?>">

index.php
<?php

require_once("inc/config.php");

$search_term = "";
if (isset($_GET["s"])) {
    $search_term = trim($_GET["s"]);
    if ($search_term != "") {
        require_once(ROOT_PATH . "inc/products.php");
        $products = get_products_search($search_term);
    }
}

$pageTitle = "Search";
$section = "search";
include(ROOT_PATH . "inc/header.php"); ?>

    <div class="section shirts search page">

        <div class="wrapper">

            <h1>Search</h1>

            <form method="get" action="./">
                <input type="text" name="s" value = "<?php 
                  if (isset($search_term)) {
                     echo htmlspecialchars($search_term);
                  }
                ?>">
                <input type="submit" value="Go">
            </form>


            <?php

                if ($search_term != "") {
                    if (!empty($products)) {
                        echo '<ul class="products">';
                        foreach ($products as $product) {
                            echo get_list_view_html($product);
                        }
                        echo '</ul>';
                    } else {
                        echo '<p>No products were found matching that search term.</p>';
                    }
                }

            ?>

        </div>

    </div>

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

I got it. The code challenge did not like my spaces between the value attribute and the equal sign. :)