3v4l.org

run code in 200+ php & hhvm versions
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<?php $b = 0.270000001; $a = round($b,2); var_dump($b);var_dump($a-$b);
based on 5DNQ7
Output for 4.3.0 - 7.2.0
float(0.270000001) float(-9.9999997171807E-10)