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<?php $a = array(); $a[''] = 'key'; $a[null] = 'null'; var_dump($a); echo $a['c'];
Output for 5.3.0 - 7.2.0
array(1) { [""]=> string(4) "null" } Notice: Undefined index: c in /in/enXDA on line 7
Output for 4.3.0 - 5.2.17
array(1) { [""]=> string(4) "null" } Notice: Undefined index: c in /in/enXDA on line 7