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run code in 150+ php & hhvm versions
Bugs & Features
<?php $arr = array('32543245234543253245345' => 'foo'); var_dump(array_keys($arr));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> string(23) "32543245234543253245345" }