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<?php $a = array('z', 'a'=> 'a', '-1' => '-1' ); foreach($a as $key => $value){ var_dump($key); }
Output for 4.3.3 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(0) string(1) "a" int(-1)
Output for 4.3.0 - 4.3.2
int(0) string(1) "a" string(2) "-1"