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4.x is outdated, please check the latest version 22.x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->on('BeforeReload', Callable $callback)
The event callback name.
Callable event function.
If success, it returns true, otherwise it returns false.
Execute the callback function before the server reloads included files gracefully. Swoole can automatically reload any included files inside worker processes so that code changes can take place without interrupting server requests. This event is triggered just before all worker processes will be reloaded, read more about how to setup hot code reloading here.
This callback is triggered inside the manager process.
Since version 4.5.0
<?php
$server->on('BeforeReload', function(Swoole\Server $server)
{
// ...
});