3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function _f($a) { return 'success'; } $f = '_f'; echo $f(); ?>
Output for 7.1.0
Fatal error: Uncaught ArgumentCountError: Too few arguments to function _f(), 0 passed in /in/aZXRt on line 7 and exactly 1 expected in /in/aZXRt:3 Stack trace: #0 /in/aZXRt(7): _f() #1 {main} thrown in /in/aZXRt on line 3
Process exited with code 255.
Output for 5.1.0 - 5.6.28, 7.0.0 - 7.0.14
Warning: Missing argument 1 for _f(), called in /in/aZXRt on line 7 and defined in /in/aZXRt on line 3 success
Output for hhvm-3.10.0 - 3.12.0
Warning: _f() expects exactly 1 parameter, 0 given in /in/aZXRt on line 4 success
Output for 4.3.0 - 5.0.5
Warning: Missing argument 1 for _f() in /in/aZXRt on line 3 success