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<?php $arr['M3'] ='M3'; $wat = $arr + array("J4"=>"J4"); var_dump($wat);
Output for 4.3.0 - 5.6.26, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
array(2) { ["M3"]=> string(2) "M3" ["J4"]=> string(2) "J4" }