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4.x is outdated, please check the latest version 22.x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\Process::signal ( string $signal_no , callable $callback ) : bool
the signal number
the callback function called when the signal is triggered
Setup signal callback function.
<?php
Swoole\Process::signal(SIGALRM, function () {
static $i = 0;
echo "#{$i}\talarm\n";
$i++;
if ($i > 20) {
Swoole\Process::alarm(-1);
}
});
//100ms
Swoole\Process::alarm(100 * 1000);