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4.x is outdated, please check the latest version 22.x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\Coroutine::exists(int $cid): bool
coroutine ID.
if success, it returns TRUE, otherwise it returns FALSE.
Check if a coroutine is exists by coroutine ID.
<?php
Co\run(function () {
echo Swoole\Coroutine::exists(Swoole\Coroutine::getCid());
});