Online PHP editor | output for TRTJM

<?php $data = [ 'username' => [ '3805120' => 5, '3805121' => 7, ], 'login' => [ '3805120' => 9, '3805121' => 11, ], ]; $result = array_merge_recursive( array_combine(array_map(function($value) { return 'U'.$value; }, array_keys($data['username'])), $data['username']), array_combine(array_map(function($value) { return 'U'.$value; }, array_keys($data['login'])), $data['login']) ); $result = array_combine( array_map(function($value) { return substr($value, 1); }, array_keys($result), $result ); var_dump($result);