Deregister the WordPress core 'category' and/or 'tag' taxonomy from the core 'post' post type #wordpress #php

deregister-category-from-posts.php

<?php
// Deregister the 'category' taxonomy from the default 'post' post type.
add_action(
	'init',
	function () {
		unregister_taxonomy_for_object_type( 'category', 'post' );
	}
);

deregister-tag-from-posts.php

<?php
// Deregister the 'tag' taxonomy from the default 'post' post type.
add_action(
	'init',
	function () {
		unregister_taxonomy_for_object_type( 'post_tag', 'post' );
	}
);