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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('de' => array('a'=>3, 'c'=>4)); $arr_lang = array_map(function ($l) { global $def; return array_merge($def, $l); }, $arr_lang); ////// print_r($arr_lang);