3v4l.org

run code in 200+ php & hhvm versions
<?php $number = 1346.21; var_dump(round($number)); var_dump(round($number, -1)); var_dump(round($number, -2)); var_dump(round($number, -3)); var_dump(round($number, -4)); var_dump(round($number, -100));
based on HhLiD
Output for 7.1.25 - 7.3.5
float(1346) float(1350) float(1300) float(1000) float(0) float(0)