category_exists example

/** * Adds a new category to the database if it does not already exist. * * @since 2.0.0 * * @param int|string $cat_name Category name. * @param int $category_parent Optional. ID of parent category. * @return int|WP_Error */
function wp_create_category( $cat_name, $category_parent = 0 ) {
    $id = category_exists( $cat_name, $category_parent );
    if ( $id ) {
        return $id;
    }

    return wp_insert_category(
        array(
            'cat_name'        => $cat_name,
            'category_parent' => $category_parent,
        )
    );
}