3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = "3hello"; $b = "2"; $c = "hello"; echo $a . $b; echo "\n"; echo $b . $a; echo "\n";echo "\n"; echo $c . $b; echo "\n"; echo $b . $c;
based on IHlOs
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
3hello2 23hello hello2 2hello