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<?php $arr_one = [1,2,3,4,5]; $arr_two = [1,3,5]; $new_arr = array_map(function($arg) use ($arr_two) { return in_array($arg, $arr_two) ? "prefix_{$arg}" : $arg; }, $arr_one); var_dump($new_arr);
Output for git.master, git.master_jit, rfc.property-hooks
array(5) { [0]=> string(8) "prefix_1" [1]=> int(2) [2]=> string(8) "prefix_3" [3]=> int(4) [4]=> string(8) "prefix_5" }

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