If you are using the built-in Category Hierarchy to organize your posts, you might find yourself in a situation where you will need to execute code for all posts that are in a descendant category of a given parent category.
<?php
if( !function_exists( 'mfields_post_is_in_descendant_category' ) ) {
/*
* Post is in Descendant Category
* Copyright 2009 Michael Fields
* @license: GPL 2
* @param $cats array - an indexed array of category ids.
* @param $post_id int - optional specify a specific $post->ID to test for.
* @return bool
*/
function mfields_post_is_in_descendant_category( $cats, $post_id = null ) {
if( is_array( $cats ) ) {
foreach ( ( array ) $cats as $cat ) {
$descendants = get_term_children( ( int ) $cat, 'category' );
if ( $descendants && in_category( $descendants, $post_id ) )
return true;
}
}
return false;
}
}
/* Example Usage */
if( mfields_post_is_in_descendant_category( array( 25, 132, 543 ) ) ) {
/* Do Stuff Here... */
}
?>
ive been attempting to do the same thing with custom post types in a custom taxonomy term but I was not able to modify the code to accomplish it since i suck at php. have you attempted to do the same thing? I really appreciate the other snippets you’ve posted.