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Absolute Parent of Any Child Page

Grab the absolute parent of any child page, no matter how ‘deep’ the child page is in the navigation tree. This is great for navigation more than two levels deep. Add the snippet to functions.php.

In this example, when the user is on any child page of “Our Company,”(which has an ID of 2) it will assigned a class to the list element:

<ul class="nav"> <!-- Main nav -->
    &lt;li<?php if(is_tree("2")) echo ' class="active"'; ?>>&lt;a href="<?php bloginfo( 'url' ); ?>/our-company" title="Our Company">Our Company&lt;/a>&lt;/li>
&lt;/ul>

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