(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