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This Conditional Tag Check if a term is an ancestor of another term. This is a boolean function, meaning it returns either TRUE or FALSE.
<?php term_is_ancestor_of( $term1, $term2, $taxonomy ); ?>
This example, placed in a theme's taxonomy.php, uses Conditional Tags to show different content depending on the term being displayed. This is helpful when it is necessary to include something for any child term of a given term, instead of using taxonomy-$taxonomy-$slug.php method where you'd have to create taxonomy-$taxonomy-$slug.php files for each and every term.
The code snip below checks to see if the term called 'Music' (ID 4) for the taxonmy 'Sound' is being processed, and if so, presents a wp_nav_menu for the Music archive page, and any subterms of Music (e.g. jazz, classical.)
<?php // if the taxonomy is sound and the term is music if (term_is_ancestor_of(4, $term, 'sound') or is_term(4, 'sound')): ?> <div id="music_subnav_menu" class="subnav_menu"> <?php wp_nav_menu( array('menu' => 'Music' )); ?> </div> <? endif; ?>
term_is_ancestor_of() is located in