Php/docs/function.ibase-set-event-handler
ibase_set_event_handler
(PHP 5, PHP 7 < 7.4.0)
ibase_set_event_handler — Register a callback function to be called when events are posted
说明
ibase_set_event_handler
( callable $event_handler
, string $event_name
, string ...$even_names
) : resource
ibase_set_event_handler
( resource $connection
, callable $event_handler
, string $event_name
, string ...$event_names
) : resource
This function registers a PHP user function as event handler for the specified events.
参数
event_handlerThe callback is called with the event name and the link resource as arguments whenever one of the specified events is posted by the database.
The callback must return
falseif the event handler should be canceled. Any other return value is ignored. This function accepts up to 15 event arguments.event_nameAn event name.
event_namesAt most 15 events allowed.
返回值
The return value is an event resource. This resource can be used to free the event handler using ibase_free_event_handler().
范例
Example #1 ibase_set_event_handler() example
<?phpfunction event_handler($event_name, $link){ if ($event_name == "NEW ORDER") { // process new order ibase_query($link, "UPDATE orders SET status='handled'"); } else if ($event_name == "DB_SHUTDOWN") { // free event handler return false; }}ibase_set_event_handler($link, "event_handler", "NEW_ORDER", "DB_SHUTDOWN");?>
参见
- ibase_free_event_handler() - Cancels a registered event handler
- ibase_wait_event() - Wait for an event to be posted by the database
