PHP开发APP接口（一）

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：

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print?





<?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] view plain copy

print?





<?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] view plain copy

print?





<?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] view plain copy

print?





<?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;

}

}