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php以json或者xml 形式返回给app。明白这点就很好说了，就是把数据包装成json或者xml，返回给APP

定义抽象APP基类：

<?php
/**
* 定义API抽象类
*/
abstract class Api {

const JSON = ‘Json’;
const XML = ‘Xml’;
const ARR = ‘Array’;

/**
* 定义工厂方法
* param string $type 返回数据类型
*/
public static function factory($type = self::JSON) {
$type = isset($_GET[‘format’]) ? $_GET[‘format’] : $type;
$resultClass = ucwords($type);
require_once(‘./Response/’ . $type . ‘.php’);
return new $resultClass();
}

abstract function response($code, $message, $data);
}

以xml形式返回给APP：

<?php
class Xml extends Api {
public function response($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 => $value) {
//判断键值对，如果是数字键值不允许
if(is_numeric($key)) {
$attr = ” id='” . $key . “‘”;
$key = “item”;
}
$xml .= “<{$key}{$attr}>”;
//以递归形式返回，主要是因为数组在xml中显示是array，必须显示出来具体键值对
$xml .= is_array($value) ? self::xmlToEncode($value) : $value;
$xml .= “</{$key}>\n”;
}
return $xml;
}
}

以json格式返回数据：

<?php
/**
* 按xml方式输出通信数据
*/
class Json extends Api {
public function response($code, $message = ”, $data = array()) {
if(!(is_numeric($code))) {
return ”;
}

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

echo json_encode($result);
exit;
}
}

也可以采用这种方式组装返回数据：

<?php

class Response {
const JSON = “json”;
/**
* 按综合方式输出通信数据
* @param integer $code 状态码
* @param string $message 提示信息
* @param array $data 数据
* @param string $type 数据类型
* return string
*/
public static function show($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’) { //适合调试代码
var_dump($result);
} elseif($type == ‘xml’) {
self::xmlEncode($code, $message, $data);
exit;
} else {
// TODO
}
}
/**
* 按json方式输出通信数据
* @param integer $code 状态码
* @param string $message 提示信息
* @param array $data 数据
* return string
*/
public static function json($code, $message = ”, $data = array()) {

if(!is_numeric($code)) {
return ”;
}

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

echo json_encode($result);
exit;
}

/**
* 按xml方式输出通信数据
* @param integer $code 状态码
* @param string $message 提示信息
* @param array $data 数据
* return string
*/
public static function xmlEncode($code, $message, $data = array()) {
if(!is_numeric($code)) {
return ”;
}

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

header(“Content-Type:text/xml”);
$xml = “<?xml version=’1.0′ encoding=’UTF-8′?>\n”;
$xml .= “<root>\n”;

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

$xml .= “</root>”;
echo $xml;
}

public static function xmlToEncode($data) {

$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}>\n”;
}
return $xml;
}

}