3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $var1 = "1"; $var2 = "2"; $temp1 = "var" . "5"; $temp2 = "var" . "2"; var_dump(${$temp1} ?? ${$temp2});
based on lrSoc
Output for 7.0.0 - 7.2.0
string(1) "2"
Output for 5.3.19 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/UginM on line 7
Process exited with code 255.