3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php echo (function ($echo) { // note the extra set of parentheses! return strtoupper($echo); })('Hello world!');
based on GrssG
Output for 7.0.0 - 7.2.0
HELLO WORLD!
Output for 5.3.21 - 5.6.28
Parse error: syntax error, unexpected '(', expecting ',' or ';' in /in/BDPhc on line 5
Process exited with code 255.