Modify conditional titles to include parent and page number

Question

Using conditional titles with title-tag rather than wp_title(), how do I add the immediate parent or ultimate grandparent to the title and,for multi-paged posts, the page number?

When using wp_title(), this added page numbers to multi-page posts:

if ($paged >= 2 || $page >= 2 ) echo ' ' . sprintf( __('(page %s)'), max($paged, $page) );

It doesn't work with title-tag. And I've never known how to prepend with parent/grandparent

Answer 1

You should be able to hook into the title by using wp_title filter

function se_custom_title( $title ) {
 if(x == y) {   
  $title = 'something'. $title;
 }
 return $title;
}
add_filter( 'wp_title', 'se_custom_titles' );