3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo substr("abcdef", 0, 1); // возвращает "d"
Output for 4.3.0 - 5.0.5, 5.1.1 - 7.1.0
a
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/D2vOv on line 2
Process exited with code 255.