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run code in 150+ php & hhvm versions
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<?php $array = array('param' => 'value'); $varname = 'array'; $$varname = 123; var_dump($array);
based on PcQNc
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(123)