I quickly discovered the Breadcrumb NavXT plugin which cleanly did exactly what I wanted, including integrating with themes by adding a function. I downloaded and installed the plugin. I customized the settings in the site’s dashboard then moved on to the final step: integrating the plugin with Thesis.

Here’s how to add a function to Thesis to make the breadcrumbs appear below the header.

1. Open custom_functions.php in the Thesis Custom File Editor
2. Insert the following code into custom_functions.php
3. Click the “Big Ass Save Button”
4. Check out your site with its new breadcrumb feature

/***********************************************************
********************* Breadcrumb NavXT *********************
***********************************************************/
function display_breadcrumbs() {
	?>
	<div class="breadcrumbs">
	<?php
	if(function_exists('bcn_display')) {
    		bcn_display();
	}
	?>
	</div>
	<?php
}

add_action('thesis_hook_after_header','display_breadcrumbs');

I use the Thesis theme, so I added the function to custom_functions.php and use it for an after post hook and to control the display of sidebar widgets.

Here’s the function:


function is_user_premium_member() {
$user = wp_get_current_user();
$levels = WLMAPI::GetUserLevels($user->ID);
if(in_array('Premium', $levels)) {
return true;
}
else {
return false;
}
}


This function determines whether the user is in the Premium membership level. You can make it check for a level with different name by changing the value ‘Premium’ to whatever your membership level is (e.g. ‘Gold’).

Once you have the function saved, you can use it in the “Conditional” text box of a widget. To exclude the widget for the membership level, enter: !is_user_premium_member(). To only display it for the membership level, leave off the exclamation point: is_user_premium_member().

Similarly, you can use the function within a hook like I have in the following example of an a single post advertisement hook: