WordPress at a glance
filter is not described

woocommerce_cart_item_thumbnail filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_cart_item_thumbnail', 'filter_function_name_1361', 10, 3 );
function filter_function_name_1361( $product_image, $cart_item, $cart_item_key ){
	// filter...

	return $product_image;
}
$product_image
-
$cart_item
-
$cart_item_key
-

Where the hook is called

In file: /templates/cart/mini-cart.php
woocommerce_cart_item_thumbnail
woocommerce/templates/cart/mini-cart.php 36
$thumbnail         = apply_filters( 'woocommerce_cart_item_thumbnail', $_product->get_image(), $cart_item, $cart_item_key );
woocommerce/templates/cart/cart.php 67
$thumbnail = apply_filters( 'woocommerce_cart_item_thumbnail', $_product->get_image(), $cart_item, $cart_item_key );

Where in WP core the hook is used WooCommerce

Usage not found.