3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $$a = '$a'; echo $a; echo $$a; echo $$$a;
Output for 5.0.4 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Undefined variable: a in /in/rDdXI on line 3 Notice: Undefined variable: a in /in/rDdXI on line 4 Notice: Undefined variable: a in /in/rDdXI on line 5 $a Notice: Undefined variable: a in /in/rDdXI on line 6 Notice: Undefined variable: $a in /in/rDdXI on line 6
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: a in /in/rDdXI on line 3 Notice: Undefined variable: a in /in/rDdXI on line 4 Notice: Undefined variable: a in /in/rDdXI on line 5 $a Notice: Undefined variable: a in /in/rDdXI on line 6 Notice: Undefined variable: $a in /in/rDdXI on line 6