wp-includes/taxonomy.php:2242Deletes one existing category.
$cat_idintbool|int|WP_Errorfunction wp_delete_category( $cat_id ) { return wp_delete_term( $cat_id, 'category' );}Introduced in 2.0.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/taxonomy.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.