(PECL ev >= 0.2.0)
EvWatcher::keepalive — Configures whether to keep the loop from returning
public EvWatcher::keepalive ([ bool $value ] ) : bool
Configures whether to keep the loop from returning. With keepalive value set to false the watcher won't keep Ev::run() / EvLoop::run() from returning even though the watcher is active.
Watchers have keepalive value true by default.
Clearing keepalive status is useful when returning from Ev::run() / EvLoop::run() just because of the watcher is undesirable. It could be a long running UDP socket watcher or so.
value With keepalive value set to false the watcher won't keep Ev::run() / EvLoop::run() from returning even though the watcher is active.
Returns the previous state.
Example #1 Register an I/O watcher for some UDP socket but do not keep the event loop from running just because of that watcher.
<?php
$udp_socket = ...
$udp_watcher = new EvIo($udp_socket, Ev::READ, function () { /* ... */ });
$udp_watcher->keepalive(FALSE);
?>
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https://www.php.net/manual/en/evwatcher.keepalive.php