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    Event callbacks

    If a callback is registered for an event, it will be called when the event becomes active. To associate a callback with event one can pass a callable to either Event::__construct() , or Event::set() , or one of the factory methods like Event::timer() .

    An event callback should match the following prototype:

    callback( mixed $fd = null , int $what = ?, mixed $arg = null ): void

    fd

    The file descriptor, stream resource or socket associated with the event. For signal event fd is equal to the signal number.

    what

    Bit mask of all events triggered.

    arg

    User custom data.

    Event::timer() expects the callback to match the following prototype:

    callback( mixed $arg = null ): void

    arg

    User custom data.

    Event::signal() expects the callback to match the following prototype:

    callback( int $signum = ?, mixed $arg = null ): void

    signum

    The number of the triggered signal(e.g. SIGTERM ).

    arg

    User custom data.

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    User Contributed Notes 1 note

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    xilon dot jul at gmail dot com
    11 years ago
    For event timers, the callback prototype is equivalent to sockets related callback. User arguments are given as the third parameter.

    This has been tested under : Event version 1.6.1
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