3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump(((double)round((0.9 + 0.31) * 10) / 10) == 0.66);
based on SJC4C
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
bool(false)
Output for hhvm-3.10.0

Process exited with code 153.