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error on line 2 at column 1: Extra content at the end of the document

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这是我封装的xml格式数据,  写的跟老师的一样,  一旦调用测试就报这个错误,  纠结中,  求助

源代码如下:

public static function xmlEncode($code,$message="",$data)

{

if(!is_numeric($code))

{

return "";

}

$result=array(

'code'=>$code,

'message'=>$messgae,

'data'=>$data

);

header("Content-Type:text/xml");

$xml = "<?xml version='1.0' encoding='UTF-8'?>\n";

$xml .= "<root>";

$xml .= self::xmlToEncode($result);

$xml .= "</root>";

echo $xml;

}

public static function xmlToEncode($data)

{

$xml = "";

foreach ($data as $key => $value) {

$addr = "";

if(is_numeric($key)){

$addr = "id='{$key}'";

$key = 'item';

}

$xml .= "<{$key}{$addr}>";

$xml .= is_array($value) ? self::xmlToEncode($value) : $value;

$xml .= "</{$key}>\n";

}

return $xml;

}