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I'm trying to use cat_is_ancestor_of() for custom taxonomy categories but it's not working. Is there any other way to check if a category is child of another?

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up vote 2 down vote accepted

Use term_is_ancestor_of(). That is the function cat_is_ancestor_of() is calling:

term_is_ancestor_of( $parent, $child, 'taxonomy_name' );
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