WordPress at a glance
filter is not described

woocommerce_add_to_cart_quantity filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_add_to_cart_quantity', 'filter_function_name_8932', 10, 2 );
function filter_function_name_8932( $quantity, $product_id ){
	// filter...

	return $quantity;
}
$quantity
-
$product_id
-

Where the hook is called

WC_Cart::add_to_cart()
woocommerce_add_to_cart_quantity
woocommerce/includes/class-wc-cart.php 1029
$quantity     = apply_filters( 'woocommerce_add_to_cart_quantity', $quantity, $product_id );

Where in WP core the hook is used WooCommerce

Usage not found.