3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = 3.5654654; round($a,2) = $a+1; echo $a;
based on SeHEg
Output for 5.6.0 - 5.6.30, 7.0.0 - 7.1.6
Fatal error: Can't use function return value in write context in /in/2G8Dm on line 5
Process exited with code 255.
Output for hhvm-3.15.4
Fatal error: Uncaught Error: Can't use return value in write context in /in/2G8Dm:5 Stack trace: #0 {main}
Process exited with code 255.