This can be very useful if you need to add attributes for a menu script.
/**
* Add custom attribute and value to a nav menu item's anchor based on CSS class (for MetisMenu)
* @author Sridhar Katakam
* @link https://sridharkatakam.com/
*/
add_filter( 'nav_menu_link_attributes', function ( $atts, $item, $args ) {
if ( 'open' === $item->classes[0] ) {
$atts['aria-expanded'] = 'false';
}
if ( 'open' === $item->classes[0] ) {
$atts['class'] = 'has-arrow';
}
return $atts;
}, 10, 3 ); Reference Links
https://stackoverflow.com/questions/20752318/wordpress-add-a-class-to-menu-link
