WordPress注册菜单:register_nav_menus

function register_nav_menus( $locations = array() ) {
    global $_wp_registered_nav_menus;
 
    add_theme_support( 'menus' );
 
    foreach ( $locations as $key => $value ) {
        if ( is_int( $key ) ) {
            _doing_it_wrong( __FUNCTION__, __( 'Nav menu locations must be strings.' ), '5.3.0' );
            break;
        }
    }
 
    $_wp_registered_nav_menus = array_merge( (array) $_wp_registered_nav_menus, $locations );
}