ev是一个php的事件拓展，通过PECL进行安装，以libev library为接口，是一个用C语言编写的事件循环类库，所以ev是一个高效的事件拓展。同时可通过ev让php进行异步操作。

目前仅对GNU / Linux平台提供支持，今后可能会对其他平台提供支持。

采用的是PHP协议。

范例

 stop();
    // Stop the watcher if further calls cause more than 10 iterations
    Ev::iteration() >= 10 and $w->stop();
});

// Create stopped timer. It will be inactive until we start it ourselves
$w_stopped = EvTimer::createStopped(10, 5, function($w) {
    echo "Callback of a timer created as stoppedn";

    // Stop the watcher after 2 iterations
    Ev::iteration() >= 2 and $w->stop();
});

// Loop until Ev::stop() is called or all of watchers stop
Ev::run();

// Start and look if it works
$w_stopped->start();
echo "Run single iterationn";
Ev::run(Ev::RUN_ONCE);

echo "Restart the second watcher and try to handle the same events, but don't blockn";
$w2->again();
Ev::run(Ev::RUN_NOWAIT);

$w = new EvTimer(10, 0, function() {});
echo "Running a blocking loopn";
Ev::run();
echo "ENDn";
?>

输出

2 seconds elapsed
is called every second, is launched after 2 seconds
iteration = 1
is called every second, is launched after 2 seconds
iteration = 2
is called every second, is launched after 2 seconds
iteration = 3
is called every second, is launched after 2 seconds
iteration = 4
is called every second, is launched after 2 seconds
iteration = 5
Run single iteration
Callback of a timer created as stopped
Restart the second watcher and try to handle the same events, but don't block
Running a blocking loop
is called every second, is launched after 2 seconds
iteration = 8
is called every second, is launched after 2 seconds
iteration = 9
is called every second, is launched after 2 seconds
iteration = 10
END

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