<?php
function _gs($s){echo "GOT SIG #$s\n";};
pcntl_signal(SIGUSR1, '_gs');

var_dump(getmypid());
$s = stream_socket_server('tcp://0.0.0.0:9999');

$rBase = [$s, fopen('php://stdin', 'r')];
foreach($rBase as $set){
 stream_set_blocking($set, 0);
}
while(true) {
 $r = $rBase;
 $w = [];
 $e = $rBase;

 $ss = stream_select($r, $w, $e, null);
 var_dump($ss, $r, $w, $e);

 echo "\n-------------------------------------\n";
 sleep(1);
}