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이 문서에서는 PHP 중국어 웹사이트 매뉴얼 풀어 주다
All watchers can be active(waiting for events) or inactive(paused). Only
active watchers will have their callbacks invoked. All callbacks will be
called with at least two arguments:
watcher
- the watcher, and
revents
a bitmask of received events.
Watcher callbacks are passed to the watcher contructors(the classes derived from EvWatcher - EvCheck::__construct() , EvChild::__construct() etc.). A watcher callback should match the following prototype:
$watcher
= NULL
[, int $revents
= NULL
]] )
watcher
The watcher instance(of a class extending EvWatcher ).
revents
Watcher received events .
Each watcher type has its associated bit in
revents
, so one can use the same callback for multiple watchers. The event mask is
named after the type, i.e.
EvChild
(or
EvLoop::child()
) sets
EV::CHILD
,
EvPrepare
(or
EvLoop::prepare()
) sets
Ev::PREPARE
,
EvPeriodic
(or
EvLoop::periodic()
) sets
Ev::PERIODIC
and so on, with the exception of I/O events (which can set both
Ev::READ
and
Ev::WRITE
bits).