WordPress at a glance
filter is not described

woocommerce_cart_id filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_cart_id', 'filter_function_name_5765', 10, 5 );
function filter_function_name_5765( $md5( implode() ), $product_id, $variation_id, $variation, $cart_item_data ){
	// filter...

	return $md5( implode() );
}
$md5( implode() )
-
$product_id
-
$variation_id
-
$variation
-
$cart_item_data
-

Where the hook is called

WC_Cart::generate_cart_id()
woocommerce_cart_id
woocommerce/includes/class-wc-cart.php 1003
return apply_filters( 'woocommerce_cart_id', md5( implode( '_', $id_parts ) ), $product_id, $variation_id, $variation, $cart_item_data );

Where in WP core the hook is used WooCommerce

Usage not found.