3v4l.org

run code in 300+ PHP versions simultaneously
<?php $v1 = 10.51 + 10.52 + 10.53; $v2 = 31.56; echo "$v1 - $v2\n"; var_dump($v1 == $v2); ini_set('precision', 20); echo "$v1 - $v2\n"; var_dump($v1 == $v2);

preferences:
36.15 ms | 402 KiB | 5 Q