ibase_set_event_handler()

(PHP 5, PHP 7)

Register a callback function to be called when events are posted

说明

ibase_set_event_handler(callable $event_handler,string $event_name1[,string$...]): resource

ibase_set_event_handler(resource $connection,callable $event_handler,string $event_name1[,string$...]): resource

This function registers a PHP user function as event handler for the specified events.

参数

$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_name1

An event name.

...

At 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

<?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");
?>

参见

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