WordPress at a glance
filter is not described

woocommerce_add_to_cart_hash filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_add_to_cart_hash', 'filter_function_name_7054', 10, 2 );
function filter_function_name_7054( $array, $string ){
	// filter...

	return $array;
}
$array
-
$string
-

Where the hook is called

WC_Cart::get_cart_hash()
woocommerce_add_to_cart_hash
woocommerce/includes/class-wc-cart.php 2134
$hash         = apply_filters_deprecated( 'woocommerce_add_to_cart_hash', array( $hash, $cart_session ), '3.6.0', 'woocommerce_cart_hash' );

Where in WP core the hook is used WooCommerce

Usage not found.