Php/docs/evperiodic.construct
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
$priority
= 0
]] )
Constructs EvPeriodic watcher object and starts it automatically. EvPeriodic::createStopped() method creates stopped periodic watcher.
参数
offset- See Periodic watcher operation modes
interval- See Periodic watcher operation modes
reschedule_cb- Reschedule callback. You can pass
null. See Periodic watcher operation modes callback- See Watcher callbacks .
data- Custom data associated with the watcher.
priority- Watcher priority
返回值
Returns EvPeriodic object on success.
范例
Example #1 Periodic timer. Use reschedule callback
<?php// Tick each 10.5 secondsfunction reschedule_cb ($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
