WordPress at a glance
filter is not described

woocommerce_checkout_cart_item_quantity filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_checkout_cart_item_quantity', 'filter_function_name_5740', 10, 3 );
function filter_function_name_5740( $html, $cart_item, $cart_item_key ){
	// filter...

	return $html;
}
$html
-
$cart_item
-
$cart_item_key
-

Where the hook is called

In file: /templates/checkout/review-order.php
woocommerce_checkout_cart_item_quantity
woocommerce/templates/checkout/review-order.php 39
<?php echo apply_filters( 'woocommerce_checkout_cart_item_quantity', ' <strong class="product-quantity">' . sprintf( '&times;&nbsp;%s', $cart_item['quantity'] ) . '</strong>', $cart_item, $cart_item_key ); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped ?>

Where in WP core the hook is used WooCommerce

Usage not found.