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Understanding the Hook: pre_insert_term
The pre_insert_term filter allows you to restrict or modify term creation in taxonomies.
Validate the term name and return an error if necessary.
Code Example
function restrict_category_creation($term, $taxonomy) {
if ($taxonomy === 'category' && strtolower($term) === 'forbidden') {
return new WP_Error('invalid_term', 'The term "forbidden" is not allowed.');
}
return $term;
}
add_filter('pre_insert_term', 'restrict_category_creation', 10, 2);
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