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In this tutorial, we’ll dive deep into everything that the wp_nav_menu function can do, use the Walker Class to add a sub description, and touch on some of its related functions. The function has several parameters to work with. Here are the defaults as listed in the WordPress.org Codex:
By default, the items are wrapped in an unordered list with the menu id and menu class. This parameter lets you change that if you so desire. This parameter is really nice for when you want to use the same menu twice but don’t want any child items to display in the location you’re setting up with the wp_nav_menu () function.
What to use to precede items in NAV menu?
By default it uses the old stand by wp_page_menu () and passes all of the same parameters to this function as well. These items are used to define what can be placed before and after the anchor tags ( ). You could use these to precede each item with a vertical bar, or wrap the nav items in a span tag.
How did WordPress 3 change the NAV menu?
When WordPress 3 presented us with the new Menus functionality, it changed the way we viewed navigation menus forever. No longer were we bound to using the normal page listing functions or building our own custom menu functions to integrate category and page menus as well as external or hard linked items within a nav menu.
wp_get_nav_menu_items() This function will return an array of items from a particular menu. This may be particular useful if you want to build a custom menu list without using a Walker Class.
False if there are no items or no menu was found. Given a theme_location parameter, the function displays the menu assigned to that location. If no such location exists or no menu is assigned to it, the parameter fallback_cb will determine what is displayed.