WordPress – modify title tag.

[gulliver]

I’ve previously used conditionals to modify the title tag (in the header), but since enabling title-tag support have no idea how to do some of the stuff I’d done when using wp_title().

Specifically, I’m trying to add page numbers to multi-page posts and prepend some pages with the parent/grandparent name.

[Ilan Firsov]

Not really sure but from a little search (https://developer.wordpress.org/reference/hooks/wp_title/)[wp_title filter] should still work, maybe try that.

<?php
add_filter( 'wp_title', 'my_new_title', 10, 3 );
function my_new_title( $title, $sep, $seplocation ) {
    return "123 {$sep} {$title}";
}

[gulliver]

Thanks.
Toward the bottom of that page is a note that wp_title is being deprecated and to approach things differently.

As a non-coder, I’d just about managed to grasp stuff like

if (is_404()) echo ‘file not available’;

… but how to use the revised format of

if (is_404()) {$title[‘title’] = ‘file not available’;}

is still largely a mystery to me and don’t know how to appropriately revise previously-used code.

[Ilan Firsov]

This looks to be working:

<?php
add_filter( 'pre_get_document_title', 'my_404_title' );
function my_404_title( $title ) {
    if( is_404() ) {
        return 'new 404 page title';
    }

    return $title;
}

[gulliver]

Thanks. Appreciated. :-)
Yes, that does work.
I’ve read about pre_get_document_title but not yet been able to understand it enough to be able to use it.

For example, my old header (which used wp_title) had a conditional to add page numbers to multi-page posts/pages.

// Add a page number if necessary:
if ($paged >= 2 || $page >= 2 ) echo ' ' . sprintf( __('(page %s)'), max($paged, $page) );

I still don’t know how to modify things to include this with title-tag. And I’ve never been able to prepend some pages with the parent/grandparent name.

[Ilan Firsov]

Can you post the whole old function? I can’t really tell from where you are getting the $paged and $page variables and I don’t think they are available as global variables.

[gulliver]

Thanks, Ilan.

Rather than a function, I’d been using conditionals within the title element of the header.php – an edited example of which is below.

<title><?php

// Set <title> tag based on what is being viewed.

global $page, $paged;

// Add the site name and separator.
bloginfo('name'); echo ' | ';

// Add the site description for the front page.
$site_description = get_bloginfo('description', 'display');
if ($site_description && (is_front_page())) echo "$site_description";

// Show page title on posts page.
if (is_home()) wp_title('');

// Title for 404.
if (is_404()) echo 'file not available';

// Add a page number if necessary:
if ($paged >= 2 || $page >= 2 ) echo ' ' . sprintf( __('(page %s)'), max($paged, $page) );

// Show page title.
if (is_page()) wp_title('');

//else bloginfo('name');

?></title>

[Ilan Firsov]

I think you may be able to use the same logic in the filter you just need to return the new title at the end instead of echoing it
Try this

<?php
add_filter( 'pre_get_document_title', 'my_custom_page_title' );
function my_custom_page_title( $title ) {
    global $page, $paged;

    // Add the site name and separator.
    $new_title = get_bloginfo('name') . ' | ';

    // Add the site description for the front page.
    $site_description = get_bloginfo('description', 'display');
    if ($site_description && (is_front_page())) $new_title .= $site_description;

    // Show page title on posts page.
    if (is_home()) $new_title .= $title;

    // Title for 404.
    if (is_404()) $new_title .= 'file not available';

    // Add a page number if necessary:
    if ($paged >= 2 || $page >= 2 ) $new_title .= ' ' . sprintf( __('(page %s)'), max($paged, $page) );

    // Show page title.
    if (is_page()) $new_title .= $title;


    return $new_title;
}

[gulliver]

Thanks.
I can’t get it to work.

General-template.php in core includes the line below, which seems to add the numbering to posts – but not pages.

if ( ( $paged >= 2 || $page >= 2 ) && ! is_404() ) {
$title['page'] = sprintf( __( 'page %s' ), max( $paged, $page ) );
}

[Author]

Posts