EvTimer::__construct

(PECL ev >= 0.2.0)

EvTimer::__construct — Constructs an EvTimer watcher object

说明

public EvTimer::__construct ( double $after , double $repeat , callable $callback [, mixed $data = NULL [, int $priority = 0 ]] )

Constructs an EvTimer watcher object.

参数

after: Configures the timer to trigger after after seconds.
repeat: If repeat is 0.0 , then it will automatically be stopped once the timeout is reached. If it is positive, then the timer will automatically be configured to trigger again every repeat seconds later, until stopped manually.
callback: See Watcher callbacks .
data: Custom data associated with the watcher.
priority: Watcher priority

返回值

Returns EvTimer object on success.

范例

Example #1 Simple timers

  <?php
 // Create and start timer firing after 2 seconds
 $w1  = new  EvTimer ( 2 ,  0 , function () {
    echo  "2 seconds elapsed\n" ;
});

 // Create and launch timer firing after 2 seconds repeating each second
// until we manually stop it
 $w2  = new  EvTimer ( 2 ,  1 , function ( $w ) {
    echo  "is called every second, is launched after 2 seconds\n" ;
    echo  "iteration = " ,  Ev :: iteration (),  PHP_EOL ;

     // Stop the watcher after 5 iterations
     Ev :: iteration () ==  5  and  $w -> stop ();
     // Stop the watcher if further calls cause more than 10 iterations
     Ev :: iteration () >=  10  and  $w -> stop ();
});

 // Create stopped timer. It will be inactive until we start it ourselves
 $w_stopped  =  EvTimer :: createStopped ( 10 ,  5 , function( $w ) {
    echo  "Callback of a timer created as stopped\n" ;

     // Stop the watcher after 2 iterations
     Ev :: iteration () >=  2  and  $w -> stop ();
});

 // Loop until Ev::stop() is called or all of watchers stop
 Ev :: run ();

 // Start and look if it works
 $w_stopped -> start ();
echo  "Run single iteration\n" ;
 Ev :: run ( Ev :: RUN_ONCE );

echo  "Restart the second watcher and try to handle the same events, but don't block\n" ;
 $w2 -> again ();
 Ev :: run ( Ev :: RUN_NOWAIT );

 $w  = new  EvTimer ( 10 ,  0 , function() {});
echo  "Running a blocking loop\n" ;
 Ev :: run ();
echo  "END\n" ;
 ?>

以上例程的输出类似于：

2 seconds elapsed
is called every second, is launched after 2 seconds
iteration = 1
is called every second, is launched after 2 seconds
iteration = 2
is called every second, is launched after 2 seconds
iteration = 3
is called every second, is launched after 2 seconds
iteration = 4
is called every second, is launched after 2 seconds
iteration = 5
Run single iteration
Callback of a timer created as stopped
Restart the second watcher and try to handle the same events, but don't block
Running a blocking loop
is called every second, is launched after 2 seconds
iteration = 8
is called every second, is launched after 2 seconds
iteration = 9
is called every second, is launched after 2 seconds
iteration = 10
END

参见

EvTimer::createStopped() - Creates EvTimer stopped watcher object
EvPeriodic
» ev_timer - relative and optionally repeating timeouts
» Be smart about timeouts

用户评论:

[#1] Jayesh Wadhwani [2013-07-30 14:56:04]

Example of passing custom data:

<?php // Create and start timer firing after 2 seconds with custom data $w1 = new EvTimer(2, 0, function ($w) { echo "Custom data: $w->data\n"; echo "2 seconds elapsed\n"; }, 'abcd'); Ev::run(); ?>
Running this will print out:
Custom data: abcd
2 seconds elapsed

Note that 'data' is a public property of the event EvWatcher class.