The generate_navigation_logo filter allows you to change the navigation logo.
Default (URL): Your logo set in Customize > Layout > Primary Navigation.
Usage
Please refer to the Using Filters article to learn how to use this filter.
Example
If you want to show a different navigation logo inside categories, you could do this:
add_filter( 'generate_navigation_logo','lh_category_navigation_logo' );
function lh_category_navigation_logo( $logo ) {
// Return our category logo URL
if ( is_category() ) {
return 'URL TO YOUR CATEGORY LOGO';
}
// Otherwise, return our default logo
return $logo;
}