PHP如何实现RESTful原理

首先定义一个请求数据接收类；然后请求类中根据请求类型，进行访问不通方法；

class Request { // 允许的请求方式 private static $method_type = array(‘get’, ‘post’, ‘put’, ‘patch’, ‘delete’); // 测试数据 private static $test_class = array( 1 => array(‘name’=>’测试一班’,’count’=>18), 2 => array(‘name’=>’测试二班’,’count’=>15) ); public static function getRequest() { // 请求方法 $method = strtolower($_SERVER[‘REQUEST_METHOD’]); if (in_array($method, self::$method_type)) { // 调用请求方法对应的方法 $data_name = $method . "Data"; return self::$data_name($_REQUEST); } return false; } // GET 获取信息 private static function getData($request_data) { $class_id = (int)$request_data[‘class’]; if ($class_id > 0) { // GET /class/ID: 获取某个指定班的信息 return self::$test_class[$class_id]; }else{ // GET /class: 列出所有班级 return self::$test_class; } } // POST /class 新建一个班级 private static function postData($request_data) { $class_id = (int)$request_data[‘class’]; if ($class_id == 0) { return false; } $data = array(); if (!empty($request_data[‘name’]) && isset($request_data[‘count’])) { $data[‘name’] = $request_data[‘name’]; $data[‘count’] = $request_data[‘count’]; self::$test_class[] = $data; return self::$test_class; }else{ return false; } } // PUT /class/ID 更新某个指定班级的信息(全部信息) private static function putData($request_data) { $class_id = (int)$request_data[‘class’]; if ($class_id == 0) { return false; } $data = array(); if (!empty($request_data[‘name’]) && isset($request_data[‘count’])) { $data[‘name’] = $request_data[‘name’]; $data[‘count’] = (int)$request_data[‘count’]; self::$test_class[$class_id] = $data; return self::$test_class; }else{ return false; } } // PATCH /class/ID 更新某个指定班级的信息 (部分信息) private static function pacthData($request_data) { $class_id = (int)$request_data[‘class’]; if ($class_id == 0) { return false; } if (!empty($request_data[‘name’])) { self::$test_class[$class_id][‘name’] = $request_data[‘name’]; } if (isset($request_data[‘count’])) { self::$test_class[$class_id][‘count’] = $request_data[‘count’]; } return self::$test_class; } // DELETE /class/ID 删除某个班 private static function deleteData($request_data) { $class_id = (int)$request_data[‘class’]; if ($class_id == 0) { return false; } unset(self::$test_class[$class_id]); return self::$test_class; } }

再定义一个数据输出类，将数据输出的格式进行统一的封装；最后将方法返回的数据进行输出即可。

<?php /** * 包含一个Response类，即输出类。根据接收到的Content-Type，将Request类返回的数组拼接成对应的格式，加上header后输出 */ class Response {const HTTP_VERSION = "HTTP/1.1"; public function sendResponse($data){ // 获取数据 if ($data) { $code = 200; $message = "OK"; }else{ $code = 404; $data = array('error' => "Not Found"); $message = "Not Found"; } 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($data); }elseif (strpos($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 = "

“; foreach ($responseData as $key => $value) { $html .= “”; if (is_array($value)) { foreach ($value as $k => $v) { $html .= “$k$v”; } }else{ $html .= “$key$value”; } $html .= “”; } $html .=””; return $html; } } ?>

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