WordPress the_title filter changed in nav menus

I haven’t had time to look into the exact reason or the exact version this changed, but as of at least WordPress version 4.5.2 the nav menu uses the_title multiple times for one item.

For example if your theme used something like this:

function menu_title_filter( $title ) {
return $title . ' | ';
add_filter( 'the_title', 'menu_title_filter' );

It would have one ” | ” after each menu title in previous versions, but in WordPress 4.5 ish it would show two ” | “.  Again, haven’t looked at the exact cause that changes this, but the solution is to check if the item you’re looking at is a nav_menu_item:

function menu_title_filter( $title, $id ) {
$item = get_post( $id );
if ( $item->post_type != 'nav_menu_item') return $title;
return $title . ' | ';
add_filter( 'the_title', 'menu_title_filter', 10, 2 );

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