Where do I place the PHP code to insert or not insert a menu item based upon some condition, i.e. value of another PHP variable like so:
$listItem = '';
<?php if ($condition)
{
$listItem = '<li id="menu-item-44" class="menu-item menu-item-type-taxonomy menu-item-object-category menu-item-44"><a title="Our Real Estate Blog" href="http://www.mattepstein.com/category/blog/">Blog</a></li>';
}
?>
/* html for menu list */
<?php echo $listItem; ?>
/* more html for menu list */
Use wp_get_nav_menu_items to iterate through the menu items, modifying the one that you want to in the loop. See the example code here for more information.
If the menu is displayed via regular code (
wp_nav_menu()for example), you should not callwp_get_nav_menu_items()yourself, but you should hook into it and change the output. That means you add a filter onwp_get_nav_menu_items, loop over the items, and insert your menu item at the right place.