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4.x is outdated, please check the latest version 22.x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->protect(int $fd, bool $value = true)
The file descriptor ID that you want to protect from being closed from heartbeat checks.
Set to true to stop the fd from being closed and set to false to remove the protection from being closed.
If successful, true is returned, otherwise false.
Protect the $fd (file descriptor) from being closed by the heartbeat check interval. Use $value to set or remove this protected state from a client connection.
