EvPeriodic::__construct

(PECL ev >= 0.2.0)

EvPeriodic::__construct — Constructs EvPeriodic watcher object

说明

public EvPeriodic::__construct ( double $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