EvPeriodic::__construct

(PECL ev >= 0.2.0)

EvPeriodic::__construct — Constructs EvPeriodic watcher object

Description

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.

Parameters

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

Examples

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";
});
?>

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User Contributed Notes 1 note

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1187328898 at qq dot com ¶

6 years ago

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();