爲什麼我的$ _REQUEST ['request']變量未定義（訪問API端點時）

Question

我按照教程here創建了一個使用PHP的RESTful API。

我運行在本地主機上的項目但是我越來越想查看端點時出現以下錯誤提示在本教程（API/V1 /例）：

Notice: Undefined index: request in C:\wamp64\www\API\api.php on line 8 

（注：見下面的api.php文件。）

這個請求索引應該在htaccess文件中設置，所以我認爲這就是問題所在。 （我很抱歉，如果這是簡單的，但我試圖找到自己沒有運氣。）你能幫忙嗎？

在本教程中，我們創建：

1. 一個htaccess文件如何配置Web服務器應在項目的目錄內處理請求的文件。
2. 一個抽象類，用於處理URI的解析並返回 響應。
3. 一個由 API的端點組成的具體類。

htaccess文件

<IfModule mod_rewrite.c> 
RewriteEngine On 
RewriteCond %{REQUEST_FILENAME} !-f 
RewriteCond %{REQUEST_FILENAME} !-d 
RewriteRule api/v1/(.*)$ api/v1/api.php?request=$1 [QSA,NC,L] 
</IfModule> 

抽象類

<?php 
    abstract class API 
    { 
     /** 
     * Property: method 
     * The HTTP method this request was made in, either GET, POST, PUT or DELETE 
     */ 
     protected $method = ''; 
     /** 
     * Property: endpoint 
     * The Model requested in the URI. eg: /files 
     */ 
     protected $endpoint = ''; 
     /** 
     * Property: verb 
     * An optional additional descriptor about the endpoint, used for things that can 
     * not be handled by the basic methods. eg: /files/process 
     */ 
     protected $verb = ''; 
     /** 
     * Property: args 
     * Any additional URI components after the endpoint and verb have been removed, in our 
     * case, an integer ID for the resource. eg: /<endpoint>/<verb>/<arg0>/<arg1> 
     * or /<endpoint>/<arg0> 
     */ 
     protected $args = Array(); 
     /** 
     * Property: file 
     * Stores the input of the PUT request 
     */ 
     protected $file = Null; 

     /** 
     * Constructor: __construct 
     * Allow for CORS, assemble and pre-process the data 
     */ 
     public function __construct($request) { 
      header("Access-Control-Allow-Orgin: *"); 
      header("Access-Control-Allow-Methods: *"); 
      header("Content-Type: application/json"); 

      $this->args = explode('/', rtrim($request, '/')); 
      $this->endpoint = array_shift($this->args); 
      if (array_key_exists(0, $this->args) && !is_numeric($this->args[0])) { 
       $this->verb = array_shift($this->args); 
      } 

      $this->method = $_SERVER['REQUEST_METHOD']; 
      if ($this->method == 'POST' && array_key_exists('HTTP_X_HTTP_METHOD', $_SERVER)) { 
       if ($_SERVER['HTTP_X_HTTP_METHOD'] == 'DELETE') { 
        $this->method = 'DELETE'; 
       } else if ($_SERVER['HTTP_X_HTTP_METHOD'] == 'PUT') { 
        $this->method = 'PUT'; 
       } else { 
        throw new Exception("Unexpected Header"); 
       } 
      } 

      switch($this->method) { 
      case 'DELETE': 
      case 'POST': 
       $this->request = $this->_cleanInputs($_POST); 
       break; 
      case 'GET': 
       $this->request = $this->_cleanInputs($_GET); 
       break; 
      case 'PUT': 
       $this->request = $this->_cleanInputs($_GET); 
       $this->file = file_get_contents("php://input"); 
       break; 
      default: 
       $this->_response('Invalid Method', 405); 
       break; 
      } 
     } 
     public function processAPI() { 
      if (method_exists($this, $this->endpoint)) { 
       return $this->_response($this->{$this->endpoint}($this->args)); 
      } 
      return $this->_response("No Endpoint: $this->endpoint", 404); 
     } 

     private function _response($data, $status = 200) { 
      header("HTTP/1.1 " . $status . " " . $this->_requestStatus($status)); 
      return json_encode($data); 
     } 

     private function _cleanInputs($data) { 
      $clean_input = Array(); 
      if (is_array($data)) { 
       foreach ($data as $k => $v) { 
        $clean_input[$k] = $this->_cleanInputs($v); 
       } 
      } else { 
       $clean_input = trim(strip_tags($data)); 
      } 
      return $clean_input; 
     } 

     private function _requestStatus($code) { 
      $status = array( 
       200 => 'OK', 
       404 => 'Not Found', 
       405 => 'Method Not Allowed', 
       500 => 'Internal Server Error', 
      ); 
      return ($status[$code])?$status[$code]:$status[500]; 
     } 



    } 
    ?> 

混凝土類

<?php 
require_once 'API.class.php'; 

class MyAPI extends API 
{ 
    protected $FacebookUser; 

    public function __construct($request, $origin) { 
     parent::__construct($request); 
     //I removed the User and API key code here until they are set up properly 
    } 

    /** 
    * Example of an Endpoint 
    */ 
    protected function example() { 
     if ($this->method == 'GET') { 
      return "Endpoint is working"; 
     } else { 
      return "Only accepts GET requests"; 
     } 
    } 
} 
?> 

api.php

<?php 
require_once 'MyAPI.class.php'; 
// Requests from the same server don't have a HTTP_ORIGIN header 
if (!array_key_exists('HTTP_ORIGIN', $_SERVER)) { 
    $_SERVER['HTTP_ORIGIN'] = $_SERVER['SERVER_NAME']; 
} 
try { 
    //the following $_REQUEST['request'] variable is not set. 
    $API = new MyAPI($_REQUEST['request'], $_SERVER['HTTP_ORIGIN']); 
    echo $API->processAPI(); 
} catch (Exception $e) { 
    echo json_encode(Array('error' => $e->getMessage())); 
} 
?> 

Answer 1

讀你的.htaccess文件，你需要一個層次更多這樣的：

API 
├── api 
│   └── v1 
│    └── api.php 
└── .htaccess 

其中API是目前你的文檔根目錄的子文件夾（在未來，你將可能使API文檔根目錄或移動文件相應）。

內容的API/.htaccess：API/api/v1/api.php（查詢重寫工作）的

RewriteEngine On 
RewriteCond %{REQUEST_FILENAME} !-f 
RewriteCond %{REQUEST_FILENAME} !-d 
RewriteRule api/v1/(.*)$ api/v1/api.php?request=$1 [QSA,NC,L] 

內容：

<?php 
var_dump($_REQUEST); 

然後請求爲：

example.com/API/api/v1/foo 

應該重寫你的API 。php文件（通過重寫規則）和api.php應該輸出：

array(1) { ["request"]=> string(3) "foo" } 

Answer 2

$_REQUEST是客戶端發送的請求變量數組。不保證該數組內部存在密鑰request。嘗試使用調試器或var_dump來顯示數組的內容。

也許如果你更新你的問題與你發送的請求有人可以引導你進一步。