Change label of title field for posts in the backend

Question

I am trying to add some HTML to the title label in the backend of WordPress.

Attempt 1:

I am using the following (simplified) function:

function change_post_titles() {
    global $post, $title, $action, $current_screen;

    $title = 'foo<br>bar';
}
add_action('admin_head', 'change_post_titles');

This works in the way that the label of the title field is indeed changed, however the HTML tags get encoded afterwards. This mean that the label looks like:

foo<br>bar

Instead of:

foo
bar

Attempt 2:

I also tried using a gettext filter, but that just completely filters (removes) the HTML.

add_filter('gettext', 'change_post_titles');
function change_post_titles( $translated_text, $text, $domain ) {
    return $translated_text = 'foo<br>bar';
}

Is there any way to change the title label (programmatically) in a way I can add HTML?

Answer 1

It is not possible to add HTML to it.

For example, wp-admin/edit.php uses the following code:

<h1 class="wp-heading-inline">
<?php
echo esc_html( $post_type_object->labels->name );
?>
</h1>

As you can see, this uses the esc_html() function. This prevents you from adding html code. This works this way for security reasons.

Answer 2

function change_post_titles() {
    global $post, $title, $action, $current_screen;
    $title = "foo<br>bar";
    $title = str_replace('<br>', ' ', $title);
}
add_action('admin_head', 'change_post_titles');

Use this this will give the result you want. Please check it let me know for any doubts.