WordPress at a glance
filter is not described

woocommerce_cart_item_subtotal filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_cart_item_subtotal', 'filter_function_name_6119', 10, 3 );
function filter_function_name_6119( $WC()->cart->get_product_subtotal, $cart_item, $cart_item_key ){
	// filter...

	return $WC()->cart->get_product_subtotal;
}
$WC()->cart->get_product_subtotal
-
$cart_item
-
$cart_item_key
-

Where the hook is called

In file: /templates/checkout/review-order.php
woocommerce_cart_item_subtotal
woocommerce/templates/checkout/review-order.php 43
<?php echo apply_filters( 'woocommerce_cart_item_subtotal', WC()->cart->get_product_subtotal( $_product, $cart_item['quantity'] ), $cart_item, $cart_item_key ); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped ?>
woocommerce/templates/cart/cart.php 127
echo apply_filters( 'woocommerce_cart_item_subtotal', WC()->cart->get_product_subtotal( $_product, $cart_item['quantity'] ), $cart_item, $cart_item_key ); // PHPCS: XSS ok.

Where in WP core the hook is used WooCommerce

Usage not found.