render_block_core_comments

WordPress Version: 6.1

/**
 * Server-side rendering of the `core/comments` block.
 *
 * @package WordPress
 */
/**
 * Renders the `core/comments` block on the server.
 *
 * This render callback is mainly for rendering a dynamic, legacy version of
 * this block (the old `core/post-comments`). It uses the `comments_template()`
 * function to generate the output, in the same way as classic PHP themes.
 *
 * As this callback will always run during SSR, first we need to check whether
 * the block is in legacy mode. If not, the HTML generated in the editor is
 * returned instead.
 *
 * @param array    $attributes Block attributes.
 * @param string   $content    Block default content.
 * @param WP_Block $block      Block instance.
 * @return string Returns the filtered post comments for the current post wrapped inside "p" tags.
 */
function render_block_core_comments($attributes, $content, $block)
{
    global $post;
    $post_id = $block->context['postId'];
    if (!isset($post_id)) {
        return '';
    }
    $comment_args = array('post_id' => $post_id, 'count' => true, 'status' => 'approve');
    // Return early if there are no comments and comments are closed.
    if (!comments_open($post_id) && get_comments($comment_args) === 0) {
        return '';
    }
    // If this isn't the legacy block, we need to render the static version of this block.
    $is_legacy = 'core/post-comments' === $block->name || !empty($attributes['legacy']);
    if (!$is_legacy) {
        return $block->render(array('dynamic' => false));
    }
    $post_before = $post;
    $post = get_post($post_id);
    setup_postdata($post);
    ob_start();
    /*
     * There's a deprecation warning generated by WP Core.
     * Ideally this deprecation is removed from Core.
     * In the meantime, this removes it from the output.
     */
    add_filter('deprecated_file_trigger_error', '__return_false');
    comments_template();
    remove_filter('deprecated_file_trigger_error', '__return_false');
    $output = ob_get_clean();
    $post = $post_before;
    $classnames = array();
    // Adds the old class name for styles' backwards compatibility.
    if (isset($attributes['legacy'])) {
        $classnames[] = 'wp-block-post-comments';
    }
    if (isset($attributes['textAlign'])) {
        $classnames[] = 'has-text-align-' . $attributes['textAlign'];
    }
    $wrapper_attributes = get_block_wrapper_attributes(array('class' => implode(' ', $classnames)));
    /*
     * Enqueues scripts and styles required only for the legacy version. That is
     * why they are not defined in `block.json`.
     */
    wp_enqueue_script('comment-reply');
    enqueue_legacy_post_comments_block_styles($block->name);
    return sprintf('<div %1$s>%2$s</div>', $wrapper_attributes, $output);
}