3v4l.org

run code in 300+ PHP versions simultaneously
<?php $b = 0.27*28; $a = round($b,2); var_dump($a-$b);
Output for 8.0.0 - 8.0.26, 8.1.0 - 8.1.13
float(-8.881784197001252E-16)
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
float(-8.8817841970013E-16)

preferences:
40.52 ms | 413 KiB | 5 Q