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<?php $langCols = ['en', 'es', 'de']; array_walk($langCols, function (&$lang) { $lang = 'description_' . $lang; }); var_dump($lang, $langCols);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $lang in /in/cEPkP on line 6 NULL array(3) { [0]=> string(14) "description_en" [1]=> string(14) "description_es" [2]=> string(14) "description_de" }

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