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<?php $array["\x00\x01\x02"] = 'foo'; var_dump($array); var_dump(key($array));
Output for 4.3.5 - 7.2.0
array(1) { [""]=> string(3) "foo" } string(3) ""
Output for 4.3.0 - 4.3.4
array(1) { [""]=> string(3) "foo" } string(3) ""