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<?php $a= ['d'=>'d','b'=>'b']; unset($a['f']); var_dump($a);
Output for 5.6.30, hhvm-3.15.4 - 3.22.0, 7.0.0 - 7.3.0rc3
array(2) { ["d"]=> string(1) "d" ["b"]=> string(1) "b" }