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run code in 150+ php & hhvm versions
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<?php $vars = array(8.78776 => "value"); var_dump($vars);
based on ogufh
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
array(1) { [8]=> string(5) "value" }