PHP如何实现RESTful原理

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)
 {
$html = "<table border='1'>";
foreach ($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;
 }
  }
  ?>

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