(PHP 5, PHP 7, PHP 8)
php_user_filter::onClose — Called when closing the filter
This method is called upon filter shutdown (typically, this is also
during stream shutdown), and is executed after
the flush method is called. If any resources
were allocated or initialized during onCreate()
this would be the time to destroy or dispose of them.
Diese Funktion besitzt keine Parameter.
Return value is ignored.