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EvTimer::__construct

(PECL ev >= 0.2.0)

EvTimer::__construct — Constructs an EvTimer watcher object

Description

代码语言:javascript
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public EvTimer::__construct (  double $after  ,  double $repeat  ,  callable $callback  [,  mixed $data  = NULL  [,  int $priority  = 0  ]] )

Constructs an EvTimer watcher object.

Parameters

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

data

Custom data associated with the watcher.

priority

Watcher priority

Return Values

Returns EvTimer object on success.

Examples

Example #1 Simple timers

代码语言:javascript
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<?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";
?>

The above example will output something similar to:

代码语言:javascript
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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

See Also

  • EvTimer::createStopped() - Creates EvTimer stopped watcher object
  • EvPeriodic

← EvTimer::again

EvTimer::createStopped →

代码语言:txt
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 ? 1997–2017 The PHP Documentation Group

Licensed under the Creative Commons Attribution License v3.0 or later.

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