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I just added the following filter in my theme `functions.php` file:

function change_the_title() {
return 'My modified title';
}
add_filter('wp_title', 'change_the_title');

And in my `header.php`:

<!DOCTYPE html>
<html <?php language_attributes(); ?>>
<head>
<meta charset="<?php bloginfo( 'charset' ); ?>">
<meta id="viewport" name="viewport" content="width=device-width">
<link rel="profile" href="http://gmpg.org/xfn/11">
<link rel="pingback" href="<?php bloginfo( 'pingback_url' ); ?>">
<?php wp_head(); ?>
</head>
<body <?php body_class();?>>

Then, I found the title of my page did **NOT** change! And the title tag was injected in the `wp_head` function.

More, if I call the function `wp_title` manually in the header, it does return the expected value.

What's the matter? How can I work around it?

---

Addition: My WordPress version is 4.4.

Not sure if its necessary to inject the variable, but try this.

function change_the_title($title) {
return 'My modified title';
}
add_filter('wp_title', 'change_the_title');

you are missing `title` in your `head` tag, Add In `<head>` tag

`<title><?php wp_title('|', true, 'left'); ?></title>` your wp_filter will work normally.

I finally found out that the WordPress core code was changed, see the below piece of code.

/**
* Displays title tag with content.
*
* @ignore
* @since 4.1.0
* @since 4.4.0 Improved title output replaced `wp_title()`.
* @access private
*/
function _wp_render_title_tag() {
if ( ! current_theme_supports( 'title-tag' ) ) {
return;
}

echo '<title>' . wp_get_document_title() . '</title>' . "\n";
}

So, after 4.4, the core do not inject the `wp_title` result into the header `<title>` tag, but do the same thing with a new function `wp_get_document_title`.

So instead, we can do the same thing by:

*1. change the title directly:*

add_filter('pre_get_document_title', 'change_the_title');
function change_the_title() {
return 'The expected title';
}

*2. filtering the title parts:*

add_filter('document_title_parts', 'filter_title_part');
function filter_title_part($title) {
return array('a', 'b', 'c');
}
For more, see the details here: <https://developer.wordpress.org/reference/functions/wp_get_document_title/>

> PS: Looking into the source of function `wp_get_document_title` is a good idea, the hooks inside which tells a lot.

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