ajax phpの中国語文字化けの解決方法

$gg=array('a'=>'中国','b'=>'日本','c'=>'美国','d'=>'加拿大','e'=>'法国');
$yy=array('f'=>'6','g'=>'7','h'>='8','i'=>'tom','j'=>'kevin');

echo $json=json_encode($gg);

{"a":"\u4e2d\u56fd","b":"\u65e5\u672c","c":"\u7f8e\u56fd","d":"\u52a0\u62ff\u5927","e":"\u6cd5\u56fd"}

echo $json=json_encode(array($gg,$yy));

[{"a":"\u4e2d\u56fd","b":"\u65e5\u672c","c":"\u7f8e\u56fd","d":"\u52a0\u62ff\u5927","e":"\u6cd5\u56fd"},{"f":"6","g":"7","0":true,"i":"tom","j":"kevin"}]

function JSON($array) { 
    arrayRecursive($array, 'urlencode', true); 
    $json = json_encode($array); 
    return urldecode($json); 
}
function arrayRecursive(&$array, $function, $apply_to_keys_also = false){ 
    static $recursive_counter = 0; 
    if (++$recursive_counter > 1000) { 
        die('possible deep recursion attack'); 
    } 
    foreach ($array as $key => $value) { 
        if (is_array($value)) { 
            arrayRecursive($array[$key], $function, $apply_to_keys_also); 
        } else { 
            $array[$key] = $function($value); 
        }                                        
        if ($apply_to_keys_also && is_string($key)) { 
            $new_key = $function($key); 
            if ($new_key != $key) { 
                $array[$new_key] = $array[$key]; 
                unset($array[$key]); 
            } 
        } 
    } 
    $recursive_counter--; 
}

[{"a":"中国","b":"日本","c":"美国","d":"加拿大","e":"法国"},{"f":"6","g":"7","0":"1","i":"tom","j":"kevin"}]