怎麼給數群組轉換編碼

如何給數群組轉換編碼
做了一個要變成的Json的二維數組，請問用什麼方法能把這個二維數群組轉換編碼？原來是gb2312的
用mb_convert_encoding()只能轉換字串的吧？
------解決思路----------------------

function gbk2utf8(&$array){
static $i = 0;
if (++$i > 1000) {
die('possible deep recursion attack');
}
foreach ($array as $key => $value) {
if (is_array($value)) {
gbk2utf8($array[$key]);
} else {
$array[$key] = iconv('GB2312','UTF-8',$value);
}
}
$i--;
}

------解決思路----------------------
如果鍵不是中文的

array_walk_recursive($ar, function(&$v) {
  $v = iconv('gbk', 'utf-8', $v);
});

如果鍵有中文的，可以這樣

parse_str(iconv('gbk', 'utf-8', urldecode(http_build_query($ar))), $ar);

未經嚴密測試，不保證正確
------解決思路----------------------
function turn_ro($arr){
$new_arr = array();
foreach($arr as $key=>$value){

$key1 = iconv('gb2312','utf-8',$key);
$value1 = iconv('gb2312','utf-8',$value);
$new_arr[$key1] = $value1;
}
return $new_arr;
}


$arr1 = Array (
Array (
'測試鍵-' => '測試紙1',
'測試鍵2' => '測試之二',
'brand_name' => 'TCI',
'pro_info' => '耗材',
'parent_categ_code' => 'S',
'child_categ_code' => 'S',

'create_time' => '1415774748' ),
Array (
'測試鍵-' => '測試紙1',
'測試鍵2' => '測試之二',
'brand_name' => 'TCI',
'sup_name' => '百靈威',
'cn_name' => 'EthylAcetate',
'en_name' => '乙酸乙酯1',
'pinyin' => 'yisuanyizhi',
'pro_info' => '文具',
'parent_categ_code' => 'S',
'child_categ_code' => 'S',

'create_time' => '1415774748' ),


);

$new_arr = array_map('turn_ro',$arr1);

print_r($new_arr);
針對二維數組的，多維不能用此方法

