php的一個簡單restful的BaseController

<?php


class BaseController
{
    private $httpVersion = "HTTP/1.1";
    private $pdo = null;

    public function getPdo()
    {
        if (null == $this->pdo) {
            $dbms = 'mysql';     //數據庫類型
            $dbName = 'qbit';    //使用的數據庫

            $host = 'localhost'; //數據庫主機名
            $user = 'root';      //數據庫連接用戶名
            $pass = '';          //對應的密碼
            $dsn = "$dbms:host=$host;dbname=$dbName";
            $this->pdo = new PDO($dsn, $user, $pass, array(PDO::ATTR_PERSISTENT => true));
        }
        return $this->pdo;
    }

    public function doQuery($sql)
    {
        $rawData = $this->getPdo()->query($sql);
        if (true || empty($rawData)) {
            $statusCode = 404;
            $rawData = array('error' => 'No sites found!');
        } else {
            $statusCode = 200;
        }

        $requestContentType = $_SERVER['HTTP_ACCEPT'];
        $this->setHttpHeaders($requestContentType, $statusCode);

        if (strpos($requestContentType, 'application/json') !== false) {
            $response = $this->encodeJson($rawData);
            echo $response;
        } else if (strpos($requestContentType, 'text/html') !== false) {
            $response = $this->encodeHtml($rawData);
            echo $response;
        } else if (strpos($requestContentType, 'application/xml') !== false) {
            $response = $this->encodeXml($rawData);
            echo $response;
        }
    }
    public function doCommand($sqls){
        $pdo=$this->getPdo();
        $pdo->beginTransaction();
        try {
            foreach ($sqls as $sql) {
                $pdo->exec($sql);
            }
            $pdo->commit();
        }catch (Exception $e){
            $pdo->rollBack();
            echo 'Message: ' .$e->getMessage();
        }
    }

    public function setHttpHeaders($contentType, $statusCode)
    {

        $statusMessage = $this->getHttpStatusMessage($statusCode);

        header($this->httpVersion . " " . $statusCode . " " . $statusMessage);
        header("Content-Type:" . $contentType);
    }

    public function getHttpStatusMessage($statusCode)
    {
        $httpStatus = array(
            100 => 'Continue',
            101 => 'Switching Protocols',
            200 => 'OK',
            201 => 'Created',
            202 => 'Accepted',
            203 => 'Non-Authoritative Information',
            204 => 'No Content',
            205 => 'Reset Content',
            206 => 'Partial Content',
            300 => 'Multiple Choices',
            301 => 'Moved Permanently',
            302 => 'Found',
            303 => 'See Other',
            304 => 'Not Modified',
            305 => 'Use Proxy',
            306 => '(Unused)',
            307 => 'Temporary Redirect',
            400 => 'Bad Request',
            401 => 'Unauthorized',
            402 => 'Payment Required',
            403 => 'Forbidden',
            404 => 'Not Found',
            405 => 'Method Not Allowed',
            406 => 'Not Acceptable',
            407 => 'Proxy Authentication Required',
            408 => 'Request Timeout',
            409 => 'Conflict',
            410 => 'Gone',
            411 => 'Length Required',
            412 => 'Precondition Failed',
            413 => 'Request Entity Too Large',
            414 => 'Request-URI Too Long',
            415 => 'Unsupported Media Type',
            416 => 'Requested Range Not Satisfiable',
            417 => 'Expectation Failed',
            500 => 'Internal Server Error',
            501 => 'Not Implemented',
            502 => 'Bad Gateway',
            503 => 'Service Unavailable',
            504 => 'Gateway Timeout',
            505 => 'HTTP Version Not Supported');
        return ($httpStatus[$statusCode]) ? $httpStatus[$statusCode] : $httpStatus[500];
    }
    public function encodeHtml($responseData) {

        $htmlResponse = "<table border='1'>";
        foreach($responseData as $key=>$value) {
            $htmlResponse .= "<tr><td>". $key. "</td><td>". $value. "</td></tr>";
        }
        $htmlResponse .= "</table>";
        return $htmlResponse;
    }

    public function encodeJson($responseData) {
        return json_encode($responseData);
    }

    public function encodeXml($responseData) {
        // 創建 SimpleXMLElement 對象
        $xml = new SimpleXMLElement('<?xml version="1.0"?><site></site>');
        foreach($responseData as $key=>$value) {
            $xml->addChild($key, $value);
        }
        return $xml->asXML();
    }
}