Structured Data Markup for Schema, Facebook Open Graph, Twitter...

[mc12345678]

Hi torvista,
My eyes are deceiving me... htmlentities() is only used for the Twitter URL, not for the others.
Still, none of them work in my browser with the "&" or with "&" (htmlentities() merely encodes the "&" again for Twitter).

Gernot,
What about if you add the following file to your site:
includes/extra_configures/patch_clean_ampersands.php
to have the contents of that file as found at: https://raw.githubusercontent.com/ze...ampersands.php

<?php
/*
 * Patch GET 20191111
 * 
 * @package initSystem
 * @copyright Copyright 2003-2020 Zen Cart Development Team
 * @license http://www.zen-cart.com/license/2_0.txt GNU Public License V2.0
 * @version $Id: patch_clean_ampersands.php New in v1.5.7 $
 */
/**
 * Suitable for versions of Zen Cart prior to v1.5.7
 *
 * Non-sanitization/access - $_GET
 *
 * Please Note : This file should be placed in includes/extra_configures and will automatically load.
 *  
 */

if (!isset($_GET)) {
    return;
}
if (!is_array($_GET)) {
    return;
}
foreach ($_GET as $key => $value) {
    if ($key === 'amp;') continue;
    if (strpos($key, 'amp;') !== 0) {
        continue;
    }
    $newtext = substr($key, 4);
    if (isset($_GET[$newtext])) continue;

    $_GET[$newtext] = $_GET['amp;' . $newtext];
    unset($_GET['amp;' . $newtext]);
}

Does that resolve the issue of not being able to reach the page associated with & being encoded?