EventEmitterInterface.php

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<?php

namespace Sabre\Event;

interface EventEmitterInterface {

    function on($eventName, callable $callBack, $priority = 100);

    function once($eventName, callable $callBack, $priority = 100);

    function emit($eventName, array $arguments = [], callable $continueCallBack = null);

    function listeners($eventName);

    function removeListener($eventName, callable $listener);

    function removeAllListeners($eventName = null);

}