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4.x is outdated, please check the latest version 22.x
Latest version:
pecl install openswoole-22.1.2
<?php Swoole\Server->on('Timer', Callable $callback)
The event callback name.
Callable event function.
If success, it returns true, otherwise it returns false.
Execute the callback function when receiving Timer tick events.
A Timer can be added to the server with $server->addTimer method.
<?php
function(Swoole\Server $server, int $interval)
{
// ...
}