woocommerce_order_amount_item_tax │ filter-hook │ WC 1.0

Usage

add_filter( 'woocommerce_order_amount_item_tax', 'wp_kama_woocommerce_order_amount_item_tax_filter', 10, 4 );

/**
 * Function for `woocommerce_order_amount_item_tax` filter-hook.
 * 
 * @param  $tax   
 * @param  $item  
 * @param  $round 
 * @param  $that  
 *
 * @return 
 */
function wp_kama_woocommerce_order_amount_item_tax_filter( $tax, $item, $round, $that ){

	// filter...
	return $tax;
}

$tax

-

$item

-

$round

-

$that

-

Where the hook is called

return apply_filters( 'woocommerce_order_amount_item_tax', $tax, $item, $round, $this );

Where the hook is used in WooCommerce