3v4l.org

run code in 150+ php & hhvm versions
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<?php $b = 1.001; $a = round($b,2); var_dump($b);var_dump($a-$b);
based on teQfu
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
float(1.001) float(-0.00099999999999989)