(PECL event >= 1.2.6-beta)
EventListener::setCallback — The setCallback purpose
public EventListener::setCallback ( callable $cb [, mixed $arg = null ] ) : void
Adjust event connect listener's callback and optionally the callback argument.
cb The new callback for new connections. Ignored if null.
Should match the following prototype:
callback ([ EventListener $listener = null [, mixed $fd = null [, array $address = null [, mixed $arg = null ]]]] ) : void
listener The EventListener object.
fd The file descriptor or a resource associated with the listener.
address Array of two elements: IP address and the server port.
arg User custom data attached to the callback.
arg Custom user data attached to the callback. Ignored if null.
No value is returned.
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https://www.php.net/manual/en/eventlistener.setcallback.php