add_action('appthemes_init', 'ntdi_do');
/**
* Removes default 'insert_dropdown' function attached to 'walker_nav_menu_start_el' hook and add my own
*/
function ntdi_do()
{
remove_filter( 'walker_nav_menu_start_el', array('CP_Ads_Categories', 'insert_dropdown'), 10, 4 );
// this NTDI_Ads_Categories class is similar to CP_Ads_Categories but with the "insert_dropdown" function modified to my needs
$menuCats = new NTDI_Ads_Categories();
add_filter('walker_nav_menu_start_el', array($menuCats, 'insert_dropdown'), 10, 4);
}
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