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<?php $arr1 = array(); $arr2 = array(); $arr1[-1] = 5; $arr2['-1'] = 5; var_dump($arr1, $arr2);
Output for 4.3.3 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [-1]=> int(5) } array(1) { [-1]=> int(5) }
Output for 4.3.0 - 4.3.2
array(1) { [-1]=> int(5) } array(1) { ["-1"]=> int(5) }