How to use swoole to monitor whether the client is disconnected

$fd in swoole is the identifier of the TCP client connection, which is unique in the Server instance and will not be repeated in multiple processes.

Check whether the connection corresponding to fd exists.

function Server->exist(int $fd) : bool;

$fd returns true if the corresponding TCP connection exists, false if it does not exist

This interface is based on shared memory calculations and does not have any IO operations

Server->exist Available in version 1.7.18 or above

Recommended learning: swoole video tutorial

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