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run code in 200+ php & hhvm versions
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<?php $def = array('a'=>1, 'b'=>2); $arr_lang = array('a'=>3, 'c'=>4); $arr_lang = $def + $arr_lang; print_r($arr_lang);
Output for 4.3.0 - 7.2.0
Array ( [a] => 1 [b] => 2 [c] => 4 )