WordPress at a glance
filter is not described

woocommerce_cart_hash_key filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_cart_hash_key', 'filter_function_name_5291' );
function filter_function_name_5291( $string ){
	// filter...

	return $string;
}
$string
-

Where the hook is called

WC_Frontend_Scripts::get_script_data()
woocommerce_cart_hash_key
woocommerce/includes/class-wc-frontend-scripts.php 549
'cart_hash_key'   => apply_filters( 'woocommerce_cart_hash_key', 'wc_cart_hash_' . md5( get_current_blog_id() . '_' . get_site_url( get_current_blog_id(), '/' ) . get_template() ) ),

Where in WP core the hook is used WooCommerce

Usage not found.