I needed to add a sleep to a PHP process, but I didn’t want to waste a whole second on each cycle. That’s usleep:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | <?php date_default_timezone_set('America/New_York'); $t = microtime(true); $micro = sprintf("%06d",($t - floor($t)) * 1000000); $d = new DateTime( date('Y-m-d H:i:s.'.$micro, $t) ); print $d->format("Y-m-d H:i:s.u") . "\n"; usleep(100000); $t = microtime(true); $micro = sprintf("%06d",($t - floor($t)) * 1000000); $d = new DateTime( date('Y-m-d H:i:s.'.$micro, $t) ); print $d->format("Y-m-d H:i:s.u") . "\n"; sleep(1); $t = microtime(true); $micro = sprintf("%06d",($t - floor($t)) * 1000000); $d = new DateTime( date('Y-m-d H:i:s.'.$micro, $t) ); print $d->format("Y-m-d H:i:s.u") . "\n"; ?> |
Run the script, and you’ll see sub-second sleeps.
[tempuser@564240601ac2 /]# php testSleep.php
2020-07-09 14:06:20.641449
2020-07-09 14:06:20.741952
2020-07-09 14:06:21.742347