# 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

### Description

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.

### Parameters

`event_handler`

  The 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 `FALSE` if the event handler should be canceled. Any other return value is ignored. This function accepts up to 15 event arguments.

`event_name`

  An event name.

`event_names`

  At most 15 events allowed.

### Return Values

The return value is an event resource. This resource can be used to free the event handler using ibase_free_event_handler().

### Examples

Example #1 ibase_set_event_handler() example

`<?php
function 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");
?>`

### See Also

- ibase_free_event_handler() - Cancels a registered event handler
- ibase_wait_event() - Wait for an event to be posted by the database