3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function f() { $a = "_SERVER"; var_dump(isset($$a)); } f(); $a = "_SERVER"; var_dump(isset($$a));
Output for 4.3.0 - 5.6.21, hhvm-3.12.0, 7.0.0 - 7.1.0
bool(false) bool(true)
Output for hhvm-3.10.0

Process exited with code 153.