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<?php $x = array('12' => 34); var_dump($x); var_dump(gettype(key($x)));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [12]=> int(34) } string(7) "integer"