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<?php $a = array('dupa' => 2, 'zupa' => 3); unset($a['dupa']); var_dump($a);
Output for 4.3.0 - 5.6.22, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { ["zupa"]=> int(3) }