(PHP 5, PHP 7 < 7.4.0)
ibase_free_event_handler — Cancels a registered event handler
ibase_free_event_handler ( resource $event ) : bool
This function causes the registered event handler specified by event to be cancelled. The callback function will no longer be called for the events it was registered to handle.
event
An event resource, created by ibase_set_event_handler().
Returns true on success or false on failure.
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https://www.php.net/manual/en/function.ibase-free-event-handler.php