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run code in 200+ php & hhvm versions
Bugs & Features
<?php $DATA = '_GET'; var_dump(${$DATA}); function test() { $DATA = '_GET'; var_dump(${$DATA}); } test();
Output for 5.0.4 - 7.1.7, 7.2.0
array(0) { } Notice: Undefined variable: _GET in /in/39T8b on line 7 NULL
Output for 7.1.10

Process exited with code 137.
Output for 4.3.2 - 5.0.3
array(0) { } Notice: Undefined variable: _GET in /in/39T8b on line 7 NULL
Output for 4.3.0 - 4.3.1
array(1) { ["/in/39T8b"]=> string(0) "" } Notice: Undefined variable: _GET in /in/39T8b on line 7 NULL