Notice: Use of undefined constant id – assumed 'id'

[Scott]

I've implemented the code below in child theme's functions.php in order to display the category title and description on the category landing page. However, its generating an error with wp_debug:

Notice: Use of undefined constant id - assumed 'id'
Notice: Undefined variable: category

/**
* Add Category Description to Archive (and Enable HTML Markup)
*/
add_action( 'genesis_before_loop', 'my_display_category_archives_description');

function my_display_category_archives_description () {
if (is_category() ) {
echo '<h4>' . the_title() . '</h4>';
echo category_description( $category-id );
}}

[Scott]

Update, here's the fix:

if (is_category() ) {
	$cat_id = get_query_var( 'cat' );
	echo '<h4>' . get_category($cat_id)->name . '</h4>';
	echo category_description( $cat_id );
}}

[Author]

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