(PECL ev >= 0.2.0)
EvTimer::__construct — Constructs an EvTimer watcher object
$after
,
double
$repeat
,
callable
$callback
[,
mixed
$data
= NULL
[,
int
$priority
= 0
]] )Constructs an EvTimer watcher object.
after
Configures the timer to trigger after
after
seconds.
repeat
If repeat is
0.0
, then it will automatically be stopped once the timeout is reached. If
it is positive, then the timer will automatically be configured to
trigger again every repeat seconds later, until stopped manually.
callback
See Watcher callbacks .
data
Custom data associated with the watcher.
priority
Returns EvTimer object on success.
Example #1 Simple timers
<?php
// Create and start timer firing after 2 seconds
$w1 = new EvTimer(2, 0, function () {
echo "2 seconds elapsed\n";
});
// Create and launch timer firing after 2 seconds repeating each second
// until we manually stop it
$w2 = new EvTimer(2, 1, function ($w) {
echo "is called every second, is launched after 2 seconds\n";
echo "iteration = ", Ev::iteration(), PHP_EOL;
// Stop the watcher after 5 iterations
Ev::iteration() == 5 and $w->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 stopped\n";
// 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 iteration\n";
Ev::run(Ev::RUN_ONCE);
echo "Restart the second watcher and try to handle the same events, but don't block\n";
$w2->again();
Ev::run(Ev::RUN_NOWAIT);
$w = new EvTimer(10, 0, function() {});
echo "Running a blocking loop\n";
Ev::run();
echo "END\n";
?>
以上例程的输出类似于：
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
Example of passing custom data:
<?php
// Create and start timer firing after 2 seconds with custom data
$w1 = new EvTimer(2, 0, function ($w) {
echo "Custom data: $w->data\n";
echo "2 seconds elapsed\n";
}, 'abcd');
Ev::run();
?>
Running this will print out:
Custom data: abcd
2 seconds elapsed
Note that 'data' is a public property of the event EvWatcher class.