I have some Pages that have a specific string in their Title, e.g. "ASDF".

I want to remove this specific string from ever appearing inside the <title> tag on the HTML generated by my theme.

In my functions.php theme file, there's this line:

add_theme_support( 'title-tag' );

In my header.php theme file, there's this line:


That last line generates a title tag that (say) looks something like this:

<title>Blah Blah ASDF &#8211; Blog Name</title>

But if "ASDF" appears in the title tag, I want the "ASDF" string to be removed, so the output would be like:

<title>Blah Blah &#8211; Blog Name</title>

I tried adding the following code to my function.php file:

function tweak_custom_title( $title ) {
    return str_replace('ASDF', '', $title); 
add_filter( 'wp_title', 'tweak_custom_title');

But that didn't work.

Am I missing a central concept here?

1 Answer 1


FYI, I was able to get this to work by add a filter to 'document_title_parts' rather than 'wp_title', like so:

 add_filter( 'document_title_parts', 'tweak_custom_title' );

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