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<?php $i = array('a' => array(1, 2, '3'), 'b' => array('test2')); unset($i[a]); var_dump($i);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Use of undefined constant a - assumed 'a' in /in/k3Hfg on line 3 array(1) { ["b"]=> array(1) { [0]=> string(5) "test2" } }