請求xml數(shù)據(jù)的時(shí)候得到這種錯(cuò)誤：

我寫的Reponse.php代碼：

<?php

class?Response?{
	const?JSON?=?"json";
	/**
	*?按綜合方式輸出通信數(shù)據(jù)
	*?@param?integer?$code?狀態(tài)碼
	*?@param?string?$message?提示信息
	*?@param?array?$data?數(shù)據(jù)
	*?@param?string?$type?數(shù)據(jù)類型
	*?return?string
	*/
	public?static?function?show($code,?$message?=?'',?$data?=?array(),?$type?=?self::JSON)?{
		if(!is_numeric($code))?{
			return?'';
		}

		$type?=?isset($_GET['format'])???$_GET['format']?:?self::JSON;

		$result?=?array(
			'code'?=>?$code,
			'message'?=>?$message,
			'data'?=>?$data,
		);

		if($type?==?'json')?{
			self::json($code,?$message,?$data);
			exit;
		}?elseif($type?==?'array')?{
			var_dump($result);
		}?elseif($type?==?'xml')?{
			self::xmlEncode($code,?$message,?$data);
			exit;
		}?else?{
			//?TODO
		}
	}
	/**
	*?按json方式輸出通信數(shù)據(jù)
	*?@param?integer?$code?狀態(tài)碼
	*?@param?string?$message?提示信息
	*?@param?array?$data?數(shù)據(jù)
	*?return?string
	*/
	public?static?function?json($code,?$message?=?'',?$data?=?array())?{
		
		if(!is_numeric($code))?{
			return?'';
		}

		$result?=?array(
			'code'?=>?$code,
			'message'?=>?$message,
			'data'?=>?$data
		);

		echo?json_encode($result,JSON_UNESCAPED_UNICODE);
		exit;
	}

	public?function?xmlEncode($code,?$message?=?'',?$data?=?array())?{
		if(!is_numeric($code))?{
			return?'';
		}

		$result?=?array(
			'code'?=>?$code,
			'message'?=>?$message,
			'data'?=>?$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($result)?{
		$xml?=?$attr?=?'';
		foreach($result?as?$key?=>?$value)?{
			if(is_numeric($key))?{
				$attr?=?"?id='"?.?$key?.?"'";
				$key?=?"item";
			}
			$xml?.=?"<{$key}{$attr}>";
			$xml?.=?is_array($value)???self::xmlToEncode($value)?:?$value;
			$xml?.=?"</{$key}>\n";
		}
		return?$xml;
	}
}

test.php代碼如下：

<?php
	require_once('./Response.php');
	
	$arr?=?array(
		'id'?=>?1,
		'name'?=>?'singwa',
		'type'?=>?array(4,5,6),
		'test'?=>?array(1,45,67=>array(123,'tsysa'))
		
	);
	
	Response::show(20,'sucess',$arr);
?>

審查元素：

貌似<?xml version='1.0' encoding='UTF-8'?>之前多了一個(gè)空格，這個(gè)怎么處理？