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<?php $x = array('x' => 1, '0x9876' => 54321); var_dump($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(2) { ["x"]=> int(1) ["0x9876"]=> int(54321) } string(6) "string"