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run code in 150+ php & hhvm versions
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<?php $array = array('param' => 'value'); $varname = 'array[param]'; $$varname = 123; var_dump($array);
based on 2k1cI
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(1) { ["param"]=> string(5) "value" }
Output for hhvm-3.10.0

Process exited with code 153.