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DataReturn.class.php类文件如下：

<?php

/** 返回数据格式化类

* Date: 2011-08-15

* Author: fdipzone

*/

class DataReturn{ // class start

private $type;

private $xmlroot;

private $callback;

private $returnData;

public function __construct($param=array()){

$this->type = $this->exists($param,'type')? strtoupper($param['type']) : 'JSON'; // 类型 JSON,XML,CALLBACK,ARRAY

$this->xmlroot = $this->exists($param,'xmlroot')? $param['xmlroot'] : 'xmlroot'; // xml root dom name

$this->callback = $this->exists($param,'callback')? $param['callback'] : ''; // JS callback function name

$format = array();

$format['retcode'] = $this->exists($param,'format.retcode')? $param['format']['retcode'] : 'retcode';//retcode 对应名称

$format['msg'] = $this->exists($param,'format.msg')? $param['format']['msg'] : 'msg'; //msg 对应名称

$format['data'] = $this->exists($param,'format.data')? $param['format']['data'] : 'data'; //data 对应名称

$result = array();

$result[$format['retcode']] = $this->exists($param,'retcode')? $param['retcode'] : 0;

$result[$format['msg']] = $this->exists($param,'msg')? $param['msg'] : '';

$result[$format['data']] = $this->exists($param,'data')? $param['data'] : '';

$this->returnData = $result;

}

//输出数据

public function data_return(){

ob_clean();

switch($this->type){

case 'JSON':

$this->json_return();

break;

case 'XML':

$this->xml_return();

break;

case 'CALLBACK':

$this->callback_return();

break;

case 'ARRAY':

$this->array_return();

break;

default:

$this->json_return();

}

exit();

}

//输出JSON格式数据,如有callback参数则返回JSONP格式

private function json_return(){

header('content-type:text/html;charset=utf-8');

if(empty($this->callback)){

echo json_encode($this->returnData);

}else{

echo $this->callback.'('.json_encode($this->returnData).');';

}

}

//输出XML格式数据

private function xml_return(){

header('content-type:text/xml;charset=utf-8');

echo $this->xml_encode($this->returnData,$this->xmlroot);

}

//输出JSON格式数据，并调用callback方法

private function callback_return(){

header('content-type:text/html;charset=utf-8');

$this->callback = empty($this->callback)? 'callback' : $this->callback;

echo "<script type="text/javascript">rn";

echo $this->callback."(".json_encode($this->returnData).");rn";

echo "</script>";

}

//输出数组格式数据

private function array_return(){

header('content-type:text/html;charset=utf-8');

echo '<pre>';

print_r($this->returnData);

echo '</pre>';

}

//XML编码

private function xml_encode($data, $root='xmlroot', $encoding='utf-8') {

$xml = "<?xml version="1.0" encoding="" . $encoding . ""?>n";

$xml.= "<" . $root . ">n";

$xml.= $this->data_to_xml($data);

$xml.= "</" . $root . ">";

return $xml;

}

//数组转XML格式

private function data_to_xml($data) {

if (is_object($data)) {

$data = get_object_vars($data);

}

$xml = '';

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

is_numeric($key) && $key = "item id="$key"";

$xml.="<$key>";

$xml.= ( is_array($val) || is_object($val)) ? $this->data_to_xml($val) : $this->cdata($val);

list($key, ) = explode(' ', $key);

$xml.="</$key>n";

}

return $xml;

}

//判断数据是否存在

private function exists($obj,$key=''){

if($key==''){

return isset($obj) && !empty($obj);

}else{

$keys = explode('.',$key);

for($i=0,$max=count($keys); $i<$max; $i++){

if(isset($obj[$keys[$i]])){

$obj = $obj[$keys[$i]];

}else{

return false;

}

}

return isset($obj) && !empty($obj);

}

}

//判断是否需要加上<![CDATA[]]>标记

private function cdata($val){

if(!empty($val) && !preg_match('/^[A-Za-z0-9+$]/',$val)){

$val = '<![CDATA['.$val.']]>';

}

return $val;

}

} // class end

?>

demo示例程序如下：

<?php

require_once('DataReturn.class.php');

$param = array( // DataReturn 参数

'type' => 'JSON', // 输出的类型 JSON,XML,CALLBACK,ARRAY 默认为 JSON

'retcode' => '1000', // retcode 的值，默认为0

'msg' => '', // msg 的值，默认为空

'data' => array( // 要输出的数据

'id' => '100',

'name' => 'fdipzone',

'gender' => 1,

'age' => 28

),

'format' => array( // 输出的数据key格式,默认为 retcode,msg,data

'retcode' => 'status',

'msg' => 'info',

'data' => 'result'

),

'xmlroot' => 'xmlroot', // 当type=XML时,XML根节点名称，默认为xmlroot

'callback' => 'callback' /* 回调方法名称

type=JSON时，默认为空，如不为空，则输出callback({data});

type=CALLBACK时,默认为callback，自动调用页面JS回调方法

*/

);

$obj = new DataReturn($param); // 创建DataReturn类对象

$obj->data_return(); // 按格式输出数据

?>

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