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filter is not described

woocommerce_cart_item_product_id filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_cart_item_product_id', 'filter_function_name_6470', 10, 3 );
function filter_function_name_6470( $cart_item_product_id, $cart_item, $cart_item_key ){
	// filter...

	return $cart_item_product_id;
}
$cart_item_product_id
-
$cart_item
-
$cart_item_key
-

Where the hook is called

In file: /templates/cart/mini-cart.php
woocommerce_cart_item_product_id
woocommerce/templates/cart/mini-cart.php 32
$product_id = apply_filters( 'woocommerce_cart_item_product_id', $cart_item['product_id'], $cart_item, $cart_item_key );
woocommerce/templates/cart/cart.php 42
$product_id = apply_filters( 'woocommerce_cart_item_product_id', $cart_item['product_id'], $cart_item, $cart_item_key );

Where in WP core the hook is used WooCommerce

Usage not found.