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run code in 150+ php & hhvm versions
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<?php $array = array( 'foo' => NULL, ); print_r($array + array('foo' => 'bar', 'baz' => 'fizz'));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [foo] => [baz] => fizz )