I'm using a theme child of Ultra Theme. This theme is using this :

add_theme_support( 'title-tag' );

I'd like to customize the title tag of all posts & pages, here is my code :

add_filter( 'wp_title', 'my_custom_title', 10, 2);
function my_custom_title() {
    return("Foo bar");

The code is not working and I can't figure out why !

  • You need to determine whether the theme is the one having the final say. So, you could switch to a default theme, add your function as a plugin, and see whether your function now overrides the title. If not, you have just determined that a plugin is affecting things. SEO plugins often affect the title. If you do find that your function does override the title when you're working with a default theme, then you know for sure it's the theme you are using, and you can search through its files for "title" to narrow it down.
    – WebElaine
    Jun 5, 2018 at 14:55
  • Try a higher priority than 10 for the filter like 100000. Jun 5, 2018 at 16:26
  • @WebElaine i've switched to twentysixteen, added my code to the theme's functions.php and disabled all plugins : the problem remains !
    – Sami
    Jun 7, 2018 at 13:51
  • @NathanJohnson it doesn't work :(
    – Sami
    Jun 7, 2018 at 13:55

2 Answers 2


When adding title-tag support in a theme, the title tag can be filtered by several filters, but not wp_title. The reason is that if the theme supports title-tag, WordPress uses wp_get_document_title() instead of wp_title().

For themes with support for title-tag you can use document_title_parts:

add_filter( 'document_title_parts', 'filter_document_title_parts' );
function filter_document_title_parts( $title_parts ) {

    $title_parts['title'] = 'The title'; 
    $title_parts['tagline'] = 'A tagline';
    $title_parts['site'] = 'My Site';

    return $title_parts; 


Or pre_get_document_title:

add_filter( 'pre_get_document_title', 'filter_document_title' );
function filter_document_title( $title ) {

    $title = 'The title'; 

    return $title; 

  • I've removed my code and put yours (in functions.php) : it doesn't work :(
    – Sami
    Jun 7, 2018 at 16:44
  • If you use the old wp_title() function to output the document title, then you must use the old wp_title filter. If you support the more recent title-tag theme feature, then you must use the new filters you see in this answer. Do not mix them.
    – cybmeta
    Jun 7, 2018 at 18:16
  • Your Approach helped solve my issue, Thanks alot Nov 5, 2019 at 2:37

This seems to be the problem's root :

add_theme_support( 'title-tag' );

In functions.php of the child theme I've added this to cancel that function :

add_action( 'after_setup_theme', 'remove_featured_images_from_child_theme', 11 ); 
function remove_featured_images_from_child_theme() {
    remove_theme_support( 'title-tag' );

Then I've added this to header.php :

<title><?php wp_title(''); ?></title>

With this two snippets of code the wp_title filter works fine.

But I think this is not the right way since WP recommands to use add_theme_support('title-tag'), but I'm disabling it !

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