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4.x is outdated, please check the latest version 22.x
pecl install openswoole-22.0.0
<?php Swoole\Server->getWorkerId(): int|bool
Return the current worker process ID (Not the PID).
Get the current worker process ID (non-process PID), inside the
onWorkerStart event the
$workerId is the same.
Available since > v4.5.0