pings_open example

 ( $client_modified_timestamp >= $wp_modified_timestamp ) && ( $client_etag == $wp_etag ) ) :
                    ( ( $client_modified_timestamp >= $wp_modified_timestamp ) || ( $client_etag == $wp_etag ) ) ) {
                $status        = 304;
                $exit_required = true;
            }
        }

        if ( is_singular() ) {
            $post = isset( $wp_query->post ) ? $wp_query->post : null;

            // Only set X-Pingback for single posts that allow pings.             if ( $post && pings_open( $post ) ) {
                $headers['X-Pingback'] = get_bloginfo( 'pingback_url', 'display' );
            }
        }

        /** * Filters the HTTP headers before they're sent to the browser. * * @since 2.8.0 * * @param string[] $headers Associative array of headers to be sent. * @param WP $wp Current WordPress environment instance. */

add_filter( 'post_class', 'twenty_twenty_one_post_classes', 10, 3 );

/** * Add a pingback url auto-discovery header for single posts, pages, or attachments. * * @since Twenty Twenty-One 1.0 * * @return void */
function twenty_twenty_one_pingback_header() {
    if ( is_singular() && pings_open() ) {
        echo '<link rel="pingback" href="', esc_url( get_bloginfo( 'pingback_url' ) ), '">';
    }
}
add_action( 'wp_head', 'twenty_twenty_one_pingback_header' );

/** * Remove the `no-js` class from body if JS is supported. * * @since Twenty Twenty-One 1.0 * * @return void */

'%1$s Comments<span class="screen-reader-text"> on %2$s</span>',
            $comments_number
        );
        $more = sprintf( $more, number_format_i18n( $comments_number ), $post_title );
    }

    if ( false === $none ) {
        /* translators: %s: Post title. */
        $none = sprintf( __( 'Comments Off<span class="screen-reader-text"> on %s</span>' ), $post_title );
    }

    if ( 0 == $comments_number && ! comments_open() && ! pings_open() ) {
        printf(
            '<span%1$s>%2$s</span>',
            ! empty( $css_class ) ? ' class="' . esc_attr( $css_class ) . '"' : '',
            $none
        );
        return;
    }

    if ( post_password_required() ) {
        _e( 'Enter your password to view comments.' );
        return;
    }

        $show_post_comments_feed = apply_filters( 'feed_links_extra_show_post_comments_feed', $show_comments_feed );

        if ( $show_post_comments_feed && ( comments_open() || pings_open() || $post->comment_count > 0 ) ) {
            $title = sprintf(
                $args['singletitle'],
                get_bloginfo( 'name' ),
                $args['separator'],
                the_title_attribute( array( 'echo' => false ) )
            );

            $feed_link = get_post_comments_feed_link( $post->ID );

            if ( $feed_link ) {
                $href = $feed_link;
            }

    do_action( 'pre_trackback_post', $post_id, $trackback_url, $charset, $title, $excerpt, $blog_name );

    header( 'Content-Type: text/xml; charset=' . get_option( 'blog_charset' ) );

    if ( ! pings_open( $post_id ) ) {
        trackback_response( 1, __( 'Sorry, trackbacks are closed for this item.' ) );
    }

    $title   = wp_html_excerpt( $title, 250, '&#8230;' );
    $excerpt = wp_html_excerpt( $excerpt, 252, '&#8230;' );

    $comment_post_id      = (int) $post_id;
    $comment_author       = $blog_name;
    $comment_author_email = '';
    $comment_author_url   = $trackback_url;
    $comment_content      = "<strong>$title</strong>\n\n$excerpt";
    

$link      = get_permalink( $page->ID );

        // Get info the page parent if there is one.         $parent_title = '';
        if ( ! empty( $page->post_parent ) ) {
            $parent       = get_post( $page->post_parent );
            $parent_title = $parent->post_title;
        }

        // Determine comment and ping settings.         $allow_comments = comments_open( $page->ID ) ? 1 : 0;
        $allow_pings    = pings_open( $page->ID ) ? 1 : 0;

        // Format page date.         $page_date     = $this->_convert_date( $page->post_date );
        $page_date_gmt = $this->_convert_date_gmt( $page->post_date_gmt, $page->post_date );

        // Pull the categories info together.         $categories = array();
        if ( is_object_in_taxonomy( 'page', 'category' ) ) {
            foreach ( wp_get_post_categories( $page->ID ) as $cat_id ) {
                $categories[] = get_cat_name( $cat_id );
            }
        }

if ( ! empty( $pingback_args[1] ) ) {
            $post_id = url_to_postid( $pingback_args[1] );

            // If pingbacks aren't open on this post, we'll still check whether this request is part of a potential DDOS,             // but indicate to the server that pingbacks are indeed closed so we don't include this request in the user's stats,             // since the user has already done their part by disabling pingbacks.             $pingbacks_closed = false;
            
            $post = get_post( $post_id );
            
            if ( ! $post || ! pings_open( $post ) ) {
                $pingbacks_closed = true;
            }

            // Note: If is_multicall is true and multicall_count=0, then we know this is at least the 2nd pingback we've processed in this multicall.
            $comment = array(
                'comment_author_url' => $pingback_args[0],
                'comment_post_ID' => $post_id,
                'comment_author' => '',
                'comment_author_email' => '',
                'comment_content' => '',
                

    do_action_deprecated( 'dbx_post_advanced', array( $post ), '3.7.0', 'add_meta_boxes' );

    /* * Allow the Discussion meta box to show up if the post type supports comments, * or if comments or pings are open. */
    if ( comments_open( $post ) || pings_open( $post ) || post_type_supports( $post_type, 'comments' ) ) {
        add_meta_box( 'commentstatusdiv', __( 'Discussion' ), 'post_comment_status_meta_box', null, 'normal', 'core', array( '__back_compat_meta_box' => true ) );
    }

    $stati = get_post_stati( array( 'public' => true ) );
    if ( empty( $stati ) ) {
        $stati = array( 'publish' );
    }
    $stati[] = 'private';

    if ( in_array( get_post_status( $post ), $stati, true ) ) {
        /* * If the post type support comments, or the post has comments, * allow the Comments meta box. */