PHP實現RESTful風格的API實例（二）

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Response.php ：包含一個Request類，即輸出類。根據接收到的Content-Type，將Request類返回的數組拼接成對應的格式，加上header后輸出

<?php
/**
 * 輸出類
 */
class Response
{
    const HTTP_VERSION = "HTTP/1.1";

    //返回結果
    public static function sendResponse($data)
    {
        //獲取數據
        if ($data) {
            $code = 200;
            $message = 'OK';
        } else {
            $code = 404;
            $data = array('error' => 'Not Found');
            $message = 'Not Found';
        }

        //輸出結果
        header(self::HTTP_VERSION . " " . $code . " " . $message);
        $content_type = isset($_SERVER['CONTENT_TYPE']) ? $_SERVER['CONTENT_TYPE'] : $_SERVER['HTTP_ACCEPT'];
        if (strpos($content_type, 'application/json') !== false) {
            header("Content-Type: application/json");
            echo self::encodeJson($data);
        } else if (strpos($content_type, 'application/xml') !== false) {
            header("Content-Type: application/xml");
            echo self::encodeXml($data);
        } else {
            header("Content-Type: text/html");
            echo self::encodeHtml($data);
        }
    }

    //json格式
    private static function encodeJson($responseData)
    {
        return json_encode($responseData);
    }

    //xml格式
    private static function encodeXml($responseData)
    {
        $xml = new SimpleXMLElement('<?xml version="1.0"?><rest></rest>');
        foreach ($responseData as $key => $value) {
            if (is_array($value)) {
                foreach ($value as $k => $v) {
                    $xml->addChild($k, $v);
                }
            } else {
                $xml->addChild($key, $value);
            }
        }
        return $xml->asXML();
    }

    //html格式
    private static function encodeHtml($responseData)
    {
        $html = "<table border='1'>";
        foreach ($responseData as $key => $value) {
            $html .= "<tr>";
            if (is_array($value)) {
                foreach ($value as $k => $v) {
                    $html .= "<td>" . $k . "</td><td>" . $v . "</td>";
                }
            } else {
                $html .= "<td>" . $key . "</td><td>" . $value . "</td>";
            }
            $html .= "</tr>";
        }
        $html .= "</table>";
        return $html;
    }
}

index.php ：入口文件，調用Request類取得數據后交給Response處理，最后返回結果

<?php
//數據操作類
require('Request.php');
//輸出類
require('Response.php');
//獲取數據
$data = Request::getRequest();
//輸出結果
Response::sendResponse($data);

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