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 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

User Contributed Notes

1187328898 at qq dot com 22-Jun-2018 03:14


function reschedule_cb_10s ($watcher, $now) {

    return $now + 10.;

}



//PHP7.0+版本不支持reschedule_cb模式

// PHP5.6测试通过

$w5 = new EvPeriodic(0.0, 0.0, "reschedule_cb_10s", function ($w, $revents) {

    echo "w5:enter:", time(), PHP_EOL;

//    sleep(3);

    echo "w5:end:", time(), PHP_EOL;

});



Ev::run();