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run code in 200+ php & hhvm versions
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<?php var_dump(array_filter(array( 'A' => 0, 'B' => null, 'C' => '', 'D' => 0.0, 'E' => 'AA', ), 'is_null'));
based on cEgQB
Output for 4.3.0 - 7.2.0
array(1) { ["B"]=> NULL }