Hook name: $old_hook Hook type: filter Plugin ref: WooCommerce Sourcefile: File ref: WC_Deprecated_Filter_Hooks::trigger_hook() – Fire off a legacy hook with it’s args. Description: Parameters: Deprecated?: No API Letters: $,H Invokers 1 to 2 of 2 WC_Deprecated_Action_Hooks::trigger_hook() – Fire off a legacy hook with it’s args. WC_Deprecated_Filter_Hooks::trigger_hook() – Fire off a legacy hook with it’s args. Implementers