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25.x is outdated, please check the latest version 26.x
Latest version:
pecl install openswoole-26.2.0
<?php OpenSwoole\Coroutine::getPcid(int $cid = 0)
Coroutine ID. By default, getting the parent coroutine ID of the current coroutine.
Coroutine ID.
Get the parent coroutine ID of a coroutine by coroutine ID.
<?php
co::run(function () {
echo OpenSwoole\Coroutine::getPcid();
});