EvPeriodic::__construct
(PECL ev >= 0.2.0)
EvPeriodic::__construct — Constructs EvPeriodic watcher object
说明
public
EvPeriodic::__construct (
float
$offset ,
string $interval ,
callable $reschedule_cb ,
callable $callback [,
mixed $data = NULL [,
int $priority = 0 ]] )
Constructs EvPeriodic watcher object and starts it automatically. EvPeriodic::createStopped() method creates stopped periodic watcher.
参数
-
offset -
interval -
reschedule_cb -
Reschedule callback. You can pass
NULL. See Periodic watcher operation modes -
callback -
See Watcher callbacks .
-
data -
Custom data associated with the watcher.
-
priority
返回值
Returns EvPeriodic object on success.
范例
Example #1 Periodic timer. Use reschedule callback
<?php
// Tick each 10.5 seconds
function reschedule_cb ($watcher, $now) {
return $now + (10.5. - fmod($now, 10.5));
}
$w = new EvPeriodic(0., 0., "reschedule_cb", function ($w, $revents) {
echo time(), PHP_EOL;
});
Ev::run();
?>
Example #2 Periodic timer. Tick every 10.5 seconds starting at now
<?php
// Tick every 10.5 seconds starting at now
$w = new EvPeriodic(fmod(Ev::now(), 10.5), 10.5, NULL, function ($w, $revents) {
echo time(), PHP_EOL;
});
Ev::run();
?>
Example #3 Hourly watcher
<?php
$hourly = EvPeriodic(0, 3600, NULL, function () {
echo "once per hour\n";
});
?>
参见
- Periodic watcher operation modes
- EvTimer
- EvPeriodic::createStopped() - Create a stopped EvPeriodic watcher
