Joomla! 5.x Coding • Re: Behavior-Backward Compatibility plugin unchecked: issue with the Canonical URL SEO

Code:

<?php/** * @package     Joomla.Site * @subpackage  com_content * * @copyright   (C) 2006 Open Source Matters, Inc. <https://www.joomla.org> * @license     GNU General Public License version 2 or later; see LICENSE.txt */defined('_JEXEC') or die;use Joomla\CMS\Factory;use Joomla\CMS\HTML\HTMLHelper;use Joomla\CMS\Language\Associations;use Joomla\CMS\Language\Text;use Joomla\CMS\Layout\FileLayout;use Joomla\CMS\Layout\LayoutHelper;use Joomla\CMS\Router\Route;use Joomla\CMS\Uri\Uri;use Joomla\Component\Content\Administrator\Extension\ContentComponent;use Joomla\Component\Content\Site\Helper\RouteHelper;// add this use statement after use statements in the beginning:// use Joomla\Component\Fields\Administrator\Helper\FieldsHelper;$customFields = FieldsHelper::getFields('com_content.article', $this->item, true);$values = array_column($customFields, 'value', 'name');if ($values['canonical-url'] !== '') {$canonicalLink = '<link rel="canonical" href="' . $values['canonical-url'] . '" />';$document = Factory::getDocument();$document->addCustomTag($canonicalLink);};// Create shortcuts to some parameters.$params  = $this->item->params;$canEdit = $params->get('access-edit');$user    = $this->getCurrentUser();$info    = $params->get('info_block_position', 0);$htag    = $this->params->get('show_page_heading') ? 'h2' : 'h1';// Check if associations are implemented. If they are, define the parameter.$assocParam        = (Associations::isEnabled() && $params->get('show_associations'));$currentDate       = Factory::getDate()->format('Y-m-d H:i:s');$isNotPublishedYet = $this->item->publish_up > $currentDate;$isExpired         = !is_null($this->item->publish_down) && $this->item->publish_down < $currentDate;?><div class="com-content-article item-page<?php echo $this->pageclass_sfx; ?>">    <meta content="<?php echo ($this->item->language === '*') ? Factory::getApplication()->get('language') : $this->item->language; ?>">    <?php if ($this->params->get('show_page_heading')) : ?>    <div class="page-header">        <h1> <?php echo $this->escape($this->params->get('page_heading')); ?> </h1>    </div>    <?php endif;    if (!empty($this->item->pagination) && !$this->item->paginationposition && $this->item->paginationrelative) {        echo $this->item->pagination;    }    ?>    <?php $useDefList = $params->get('show_modify_date') || $params->get('show_publish_date') || $params->get('show_create_date')    || $params->get('show_hits') || $params->get('show_category') || $params->get('show_parent_category') || $params->get('show_author') || $assocParam; ?>    <?php if ($params->get('show_title')) : ?>    <div class="page-header">        <<?php echo $htag; ?>>            <?php echo $this->escape($this->item->title); ?>        </<?php echo $htag; ?>>        <?php if ($this->item->state == ContentComponent::CONDITION_UNPUBLISHED) : ?>            <span class="badge bg-warning text-light"><?php echo Text::_('JUNPUBLISHED'); ?></span>        <?php endif; ?>        <?php if ($isNotPublishedYet) : ?>            <span class="badge bg-warning text-light"><?php echo Text::_('JNOTPUBLISHEDYET'); ?></span>        <?php endif; ?>        <?php if ($isExpired) : ?>            <span class="badge bg-warning text-light"><?php echo Text::_('JEXPIRED'); ?></span>        <?php endif; ?>    </div>    <?php endif; ?>    <?php if ($canEdit) : ?>        <?php echo LayoutHelper::render('joomla.content.icons', ['params' => $params, 'item' => $this->item]); ?>    <?php endif; ?>    <?php // Content is generated by content plugin event "onContentAfterTitle" ?>    <?php echo $this->item->event->afterDisplayTitle; ?>    <?php if ($useDefList && ($info == 0 || $info == 2)) : ?>        <?php echo LayoutHelper::render('joomla.content.info_block', ['item' => $this->item, 'params' => $params, 'position' => 'above']); ?>    <?php endif; ?>    <?php if ($info == 0 && $params->get('show_tags', 1) && !empty($this->item->tags->itemTags)) : ?>        <?php $this->item->tagLayout = new FileLayout('joomla.content.tags'); ?>        <?php echo $this->item->tagLayout->render($this->item->tags->itemTags); ?>    <?php endif; ?>    <?php // Content is generated by content plugin event "onContentBeforeDisplay" ?>    <?php echo $this->item->event->beforeDisplayContent; ?>    <?php if ((int) $params->get('urls_position', 0) === 0) : ?>        <?php echo $this->loadTemplate('links'); ?>    <?php endif; ?>    <?php if ($params->get('access-view')) : ?>        <?php echo LayoutHelper::render('joomla.content.full_image', $this->item); ?>        <?php        if (!empty($this->item->pagination) && !$this->item->paginationposition && !$this->item->paginationrelative) :            echo $this->item->pagination;        endif;        ?>        <?php if (isset($this->item->toc)) :            echo $this->item->toc;        endif; ?>    <div class="com-content-article__body">        <?php echo $this->item->text; ?>    </div>        <?php if ($info == 1 || $info == 2) : ?>            <?php if ($useDefList) : ?>                <?php echo LayoutHelper::render('joomla.content.info_block', ['item' => $this->item, 'params' => $params, 'position' => 'below']); ?>            <?php endif; ?>            <?php if ($params->get('show_tags', 1) && !empty($this->item->tags->itemTags)) : ?>                <?php $this->item->tagLayout = new FileLayout('joomla.content.tags'); ?>                <?php echo $this->item->tagLayout->render($this->item->tags->itemTags); ?>            <?php endif; ?>        <?php endif; ?>        <?php        if (!empty($this->item->pagination) && $this->item->paginationposition && !$this->item->paginationrelative) :            echo $this->item->pagination;            ?>        <?php endif; ?>        <?php if ((int) $params->get('urls_position', 0) === 1) : ?>            <?php echo $this->loadTemplate('links'); ?>        <?php endif; ?>        <?php // Optional teaser intro text for guests ?>    <?php elseif ($params->get('show_noauth') == true && $user->get('guest')) : ?>        <?php echo LayoutHelper::render('joomla.content.intro_image', $this->item); ?>        <?php echo HTMLHelper::_('content.prepare', $this->item->introtext); ?>        <?php // Optional link to let them register to see the whole article. ?>        <?php if ($params->get('show_readmore') && $this->item->fulltext != null) : ?>            <?php $menu = Factory::getApplication()->getMenu(); ?>            <?php $active = $menu->getActive(); ?>            <?php $itemId = $active->id; ?>            <?php $link = new Uri(Route::_('index.php?option=com_users&view=login&Itemid=' . $itemId, false)); ?>            <?php $link->setVar('return', base64_encode(RouteHelper::getArticleRoute($this->item->slug, $this->item->catid, $this->item->language))); ?>            <?php echo LayoutHelper::render('joomla.content.readmore', ['item' => $this->item, 'params' => $params, 'link' => $link]); ?>        <?php endif; ?>    <?php endif; ?>    <?php    if (!empty($this->item->pagination) && $this->item->paginationposition && $this->item->paginationrelative) :        echo $this->item->pagination;        ?>    <?php endif; ?>    <?php // Content is generated by content plugin event "onContentAfterDisplay" ?>    <?php echo $this->item->event->afterDisplayContent; ?></div>