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<?php $a = array(); var_dump(isset($a['zig'])); var_dump(empty($a['zig'])); var_dump($a['zig']);
Output for 5.3.0 - 7.1.0
bool(false) bool(true) Notice: Undefined index: zig in /in/nZBN1 on line 9 NULL
Output for 4.3.0 - 5.2.17
bool(false) bool(true) Notice: Undefined index: zig in /in/nZBN1 on line 9 NULL