php封装一个接口类

<?php
Class Response
{
//返回数据  
    public static function show($code,$message='',$data='',$type = 'json',$callback='')
    {
        if($type=='json')
        {
            echo     self::jsonEncode($code,$message,$data);
        }elseif($type == 'xml')
        {
            echo     self::xmlEncode($code,$message,$data);
        }elseif($type == 'jsonp')
        {
            echo    $callback.'('.self::jsonEncode($code,$message,$data).')';
        }

    }

//json接口  
    public static function jsonEncode($code,$message='',$data='')
    {
        if(!is_numeric($code))
        {
            return '';
        }

        $result = array(
            'code' => $code,
            'message' => $message,
            'data' => $data,
        );
        header("Content-type:text/json;chaset=utf-8");
        return json_encode($result);
    }
//xml接口  
    public static function xmlEncode($code,$message,$data=array())
    {
        if(!is_numeric($code))
        {
            return '';
        }

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

        header("Content-type:text/xml;chaset=utf-8");
        $xml = "<?xml version='1.0' encoding='utf-8'  ?>
";
        $xml .= "<root>
";
        $xml .= self::xmlToEncode($result);
        $xml .=    "</root>
";

        return $xml;

    }

    //xml内容循环  
    public static function xmlToEncode($data)
    {
        if(empty($data))
        {
            return '';
        }
        $xml = $attr = '';
        foreach ($data 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}>
";
        }

        return $xml;
    }
}


//二维数据  
$type = isset($_GET['type'])? $_GET['type'] : 'json';

$callback = isset($_GET['callback'])? $_GET['callback'] : '';


$arr = array(
    'id'=>1,
    'name'=>'jia',
    'type'=>array(1,2,3)
);

Response::show(200,'数据返回成功',$arr,$type,$callback);