3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = 1; echo ++$a + $a++; // может вывести 4 или 5
Output for 4.3.0 - 5.0.5, 5.1.1 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
4
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/R0ljC on line 3
Process exited with code 255.