3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = 1; echo ($a) . ($a++); // Выведет 10
based on 2ipvl
Output for 5.1.1 - 7.2.0
21
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/YVHNp on line 6
Process exited with code 255.
Output for 4.3.0 - 5.0.5
11