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<?php $test = 1; $$test = 2; ${'t e s t'} = 3; var_dump($test, $$test, ${'t e s t'});
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(1) int(2) int(3)