3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php printf("%d", hexdec("ffffffffffffffff"));
Output for 4.3.0 - 5.0.1, 5.0.3 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
0
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.2
9223372036854775807