3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function a() { return array_flip(['e','b','d']); } var_dump(a()['r'] ?? 'no');
Output for 7.0.0 - 7.2.0
string(2) "no"
Output for 5.4.10 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/VuYrK on line 8
Process exited with code 255.
Output for 5.3.20 - 5.3.29
Parse error: syntax error, unexpected '[', expecting ')' in /in/VuYrK on line 5
Process exited with code 255.