3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $x = "foo"; function foo(){ echo "wtf"; } $x(); $$x();
based on F3acN
Output for 7.0.0 - 7.1.0
wtf Notice: Undefined variable: foo in /in/EKdr9 on line 5 Fatal error: Uncaught Error: Function name must be a string in /in/EKdr9:5 Stack trace: #0 {main} thrown in /in/EKdr9 on line 5
Process exited with code 255.
Output for 5.0.4 - 5.6.28, hhvm-3.10.0 - 3.12.0
wtf Notice: Undefined variable: foo in /in/EKdr9 on line 5 Fatal error: Function name must be a string in /in/EKdr9 on line 5
Process exited with code 255.
Output for 5.0.0 - 5.0.3
wtf Notice: Undefined variable: foo in /in/EKdr9 on line 5 Fatal error: Function name must be a string in /in/EKdr9 on line 5
Process exited with code 255.
Output for 4.4.5 - 4.4.9
wtf Notice: Undefined variable: foo in /in/EKdr9 on line 5 Fatal error: Call to undefined function: () in /in/EKdr9 on line 5
Process exited with code 255.
Output for 4.3.2 - 4.4.4
wtf Notice: Undefined variable: foo in /in/EKdr9 on line 5 Fatal error: Call to undefined function: () in /in/EKdr9 on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1
wtf Notice: Undefined variable: foo in /in/EKdr9 on line 5 Fatal error: Call to undefined function: () in /in/EKdr9 on line 5