function decodeUnicode($str)

{

return preg_replace_callback('/\\\\u([0-9a-f]{4})/i',

create_function(

'$matches',

'return mb_convert_encoding(pack("H*", $matches[1]), "UTF-8", "UCS-2BE");'

),

$str);

}

$arr = array('name1':"中文",'name2':'abc12');

$jsonstr = decodeUnicode(json_encode($arr));