4.x is outdated, please check the latest version 22.x

Latest version: pecl install openswoole-22.1.2


<?php Swoole\Timer::after(int $interval_ms, callable $callback_function, mixed ...$params = null)\:\ int|bool



Interval duration in milliseconds to wait before calling the callback function


Callback function to run


The parameters passed into the callback function, this is optional



if success, it returns the timer_id

if the operation failed, it returns false


Schedule a one-time callback function in the future after the set $interval_ms timeout.

This method is basically the same as Swoole\Timer::tick but the difference is this timer is only executed once and destroyed afterwards once it completes.

The after timer allows you to create a non-blocking task which will execute after a period of time, enabling you to continue on with your program and let the timer execute the callback once the interval is met.

See Swoole\Timer::tick for more information as they are similar in usage.

Callback Function Example


function() {
    // ...

You can also take advantage of the use anonymous syntax to pass parameters to the callback function:


$bar = 23;

function() use ($bar) {

    $bar += 7;

    // ...

The callback function will first include the ID of the timer that was started and then any parameters. You can use this ID to clear the timer.



$str = "Swoole";
Swoole\Timer::after(1000, function() use ($str) {
    echo "Hello, $str\n";
Last updated on November 25, 2022