WordPress at Your Fingertips
filter is not described

woocommerce_add_order_again_cart_item filter-hook . WC 1.0

Add to cart directly.

Usage

add_filter( 'woocommerce_add_order_again_cart_item', 'filter_function_name_3590', 10, 2 );
function filter_function_name_3590( $array_merge, $cart_id ){
	// filter...

	return $array_merge;
}
$array_merge
-
$cart_id
-

Where the hook is called

WC_Cart_Session::populate_cart_from_order()
woocommerce_add_order_again_cart_item
woocommerce/includes/class-wc-cart-session.php 389-404
$cart[ $cart_id ] = apply_filters(
	'woocommerce_add_order_again_cart_item',
	array_merge(
		$cart_item_data,
		array(
			'key'          => $cart_id,
			'product_id'   => $product_id,
			'variation_id' => $variation_id,
			'variation'    => $variations,
			'quantity'     => $quantity,
			'data'         => $product_data,
			'data_hash'    => wc_get_cart_item_data_hash( $product_data ),
		)
	),
	$cart_id
);

Where in WP core the hook is used WooCommerce

Usage not found.