Constructs EvPeriodic watcher object

# EvPeriodic::__construct

(PECL ev >= 0.2.0)

EvPeriodic::__construct — Constructs EvPeriodic watcher object

### 说明

public function 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

### 示例

示例 #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();
    ?>

示例 #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();
    ?>

示例 #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

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