# EvPeriodic::__construct

(PECL ev >= 0.2.0)

EvPeriodic::__construct — Constructs EvPeriodic watcher object

### Beschreibung

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.

### Parameter-Liste

`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

### Beispiele

Beispiel #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();
?>`

Beispiel #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();
?>`

Beispiel #3 Hourly watcher

`<?php
$hourly = EvPeriodic(0, 3600, NULL, function () {
echo "once per hour\n";
});
?>`

### Siehe auch

- Periodic watcher operation modes
- EvTimer
- EvPeriodic::createStopped() - Create a stopped EvPeriodic watcher

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