Speed up StreamSelectLoop #36

$t = microtime(true);
usleep(0);
$r = microtime(true);
echo ($r-$t)*1000000; //69.856643676758

$t = microtime(true);
0 && usleep(0);
$r = microtime(true);
echo ($r-$t)*1000000; //5.9604644775391

$timeout = 0;
$start = microtime(true);
for($i = 0; $i < 100000; $i++) {
    usleep($timeout);
}
echo microtime(true) - $t; //6.6996

$timeout = 0;
$start = microtime(true);
for($i = 0; $i < 100000; $i++) {
    $timeout && usleep($timeout); //skip null and 0 sleeps
}
echo microtime(true) - $t; //0.026