PHP 简例 RestFul

新年新气象,2017 年 感悟很多,感慨很多,成熟点。
这里简单介绍个接口实例。

以下代码是 RESTful 服务类 Site.php:
实例

<?php
/* 
 * RESTful 服务类
 */
Class Site {
    
    private $sites = array(
        1 => 'TaoBao',  
        2 => 'Google',  
        3 => 'Runoob',              
        4 => 'Baidu',              
        5 => 'Weibo',  
        6 => 'Sina'
            
    );
        
    
    public function getAllSite(){
        return $this->sites;
    }
    
    public function getSite($id){
        
        $site = array($id => ($this->sites[$id]) ? $this->sites[$id] : $this->sites[1]);
        return $site;
    }    
}
?>

RESTful Services URI 映射
RESTful Services URI 应该设置为一个直观简短的资源地址。Apache 服务器的 .htaccess 应设置好对应的 Rewrite 规则。
本实例我们将使用两个 URI 规则:
1、获取所有站点列表:

http://localhost/restexample/site/list/

2、使用 id 获取指定的站点,以下 URI 为获取 id 为 3 的站点:

http://localhost/restexample/site/list/3/

项目的 .htaccess 文件配置规则如下所示:

# 开启 rewrite 功能
Options +FollowSymlinks
RewriteEngine on

# 重写规则
RewriteRule ^site/list/$   RestController.php?view=all [nc,qsa]
RewriteRule ^site/list/([0-9]+)/$   RestController.php?view=single&id=$1 [nc,qsa]

RESTful Web Service 控制器
在 .htaccess 文件中,我们通过设置参数 'view' 来获取 RestController.php 文件中对应的请求,通过获取 'view' 不同的参数来分发到不同的方法上。RestController.php 文件代码如下:
实例

<?php
require_once("SiteRestHandler.php");
        
$view = "";
if(isset($_GET["view"]))
    $view = $_GET["view"];
/*
 * RESTful service 控制器
 * URL 映射
*/
switch($view){
 
    case "all":
        // 处理 REST Url /site/list/
        $siteRestHandler = new SiteRestHandler();
        $siteRestHandler->getAllSites();
        break;
        
    case "single":
        // 处理 REST Url /site/show/<id>/
        $siteRestHandler = new SiteRestHandler();
        $siteRestHandler->getSite($_GET["id"]);
        break;
 
    case "" :
        //404 - not found;
        break;
}
?>

简单的 RESTful 基础类
以下提供了 RESTful 的一个基类,用于处理响应请求的 HTTP 状态码,SimpleRest.php 文件代码如下:
实例

<?php 
/*
 * 一个简单的 RESTful web services 基类
 * 我们可以基于这个类来扩展需求
*/
class SimpleRest {
    
    private $httpVersion = "HTTP/1.1";
 
    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] : $status[500];
    }
}
?>

RESTful Web Service 处理类
以下是一个 RESTful Web Service 处理类 SiteRestHandler.php,继承了上面我们提供的 RESTful 基类,类中通过判断请求的参数来决定返回的 HTTP 状态码及数据格式,实例中我们提供了三种数据格式: "application/json" 、 "application/xml" 或 "text/html":
SiteRestHandler.php 文件代码如下:
实例

<?php 
require_once("SimpleRest.php");
require_once("Site.php");
 
class SiteRestHandler extends SimpleRest {
 
    function getAllSites() {    
 
        $site = new Site();
        $rawData = $site->getAllSite();
 
        if(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 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) {
        $jsonResponse = json_encode($responseData);
        return $jsonResponse;        
    }
    
    public function encodeXml($responseData) {
        // 创建 SimpleXMLElement 对象
        $xml = new SimpleXMLElement('<?xml version="1.0"?><site></site>');
        foreach($responseData as $key=>$value) {
            $xml->addChild($key, $value);
        }
        return $xml->asXML();
    }
    
    public function getSite($id) {
 
        $site = new Site();
        $rawData = $site->getSite($id);
 
        if(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;
        }
    }
}
?>

最后我们这样访问我们写的接口

http://localhost/site/list/ 
http://localhost/site/list/1/

本文代码来自 W3C 菜鸟教程

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