为什么我的REST API的我GET功能犯规返回任何价值？ [英] Why my GET function of my API REST doesnt return any value?

问题描述

我用 XAMPP 与 phpMyAdmin的来存储我的数据库，我试图让一个REST API ，但我不会有好结果。对于这一点，我使用超薄框架。

I'm using XAMPP with PhpMyAdmin to store my database and I'm trying to make an API REST, but I don't have good results. For that, I'm using Slim framework.

我把所有修身框架文件命名为项目文件夹里面 / htdocs目录 <$ C的文件夹中$ C> XAMPP 和创建我的 connect.php 我的 api.php 文件。我也改变我的的index.php 来使用我前面提到的两个文件。

I put all Slim framework files in a folder named project inside /htdocs in the folder of xampp and I create my connect.php and my api.php files. I also change my index.php to use both files that I mentioned before.

我可配置我的 connect.php 和的index.php 文件和我创造了我GET方法 api.php 文件，但，当我试图得到的信息是有数据库，我不能得到任何价值的。

I configurated my connect.php and index.php files and I created my GET method in the api.php file but, when I try to get the information that there is on the database I can't get any value.

这两个文件，​​我的意思是， connect.php 和 api.php 是一个名为文件夹内的应用进一步它们在库和路线分别命名为另一个文件夹。

Both files, I mean, connect.php and api.php are inside a folder named app and further they are in another folder named libs and routes respectively.

/project/app/libs/connect.php
/project/app/routes/api.php

我把这里所有的code我有：

I put here all the code I have:

的index.php

<?php

  require 'Slim/Slim.php'; 

  \Slim\Slim::registerAutoloader();

  $app = new \Slim\Slim();

  define("SPECIALCONSTANT",true);

  require 'app/libs/connect.php';
  require 'app/routes/api.php';

  $app->run();

?>

connect.php

<?php
if(!defined("SPECIALCONSTANT")) die("Access denied");

function getConnection()
{
    try{
        $db_username = "root";
        $db_password = "";
        $connection = new PDO("mysql:host=localhost;dbname=project",$db_username,$db_password);
        $connection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    }catch(PDOException $e)
    {
        echo "Error: " . $e->getMessage();
    }

    return $connection;
}
?>

api.php

<?php
if(!defined("SPECIALCONSTANT")) die("Access denied");

$app->get("/users/",function() use($app)
{
    try{
        $connection = getConnection();
        $dbh = $connection->prepare("SELECT * FROM users");
        $dbh->execute();
        $users = $dbh->fetchAll();
        $connection = null;

        $app->response->headers->set("Content-type","application/json");
        $app->response->status(200);
        $app->response->body(json_encode($users));

    }catch(PDOException $e)
    {
        echo "Error: " . $e->getMessage();
    }
});

我的数据库名称为项目和我在我的数据库中的表被命名为用户。这个数据库是坚持我的的phpmyadmin 。

My database name is project and the table that I have in my database is named users. This database is hold on my phpmyadmin.

然后，我试图返回，我对这个表我的 GET 方法在我的网址把值本地主机/项目/用户/ ，但它不工作。我刚才看到一个空白页，我在网上看到，这不得不给我，我有我的表中的值。

Then, I try to return the values that I have on this table with my get method putting in my url localhost/project/users/ but it doesn't work. I just saw a blank page and I saw on the Internet that it would have to give me the values that I have in my table.

不过，我觉得我的问题可能是在标题，状态和体，因为我无法很正确理解他们，我寻找他们的文档中，但它并没有帮助我很多。我搜索的网页是：

I though that my problem could be on headers, status and body because I couldn't understand them very properly and I search them in the documentation but it didn't help me a lot. The pages that I search were:

http://docs.slimframework.com/response/headers/
http://docs.slimframework.com/response/status/ 的 http://docs.slimframework.com/response/body/

所以，请，如果你还可以添加一些信息到clearify这些概念，我将与大家很感激。

So please if you can also add some info to clearify these concepts I will be so thankful with all of you.

我在REST API真正的新的，我不能看到我的错误（我使用的教程）。为什么它不工作？

I'm really new in API REST and I can't see my error (I'm using a tutorial). Why it doesn't work?

编辑：我试图阿卜杜阿德尔的建议，但它也没有工作。它给我下面的错误。

I tried the proposal of Abdo Adel but it also didn't work. It gives to me the following error.

详细信息

Type: ErrorException
Code: 8
Message: Undefined variable: users
File: C:\xampp\htdocs\proyecto\app\routes\api.php
Line: 21 --> Here it's the line when I have echo sentence

跟踪

0 C:\xampp\htdocs\project\app\routes\api.php(21): Slim\Slim::handleErrors(8, 'Undefined varia...', 'C:\\xampp\\htdocs...', 21, Array)
1 [internal function]: {closure}()
2 C:\xampp\htdocs\project\Slim\Route.php(468): call_user_func_array(Object(Closure), Array)
3 C:\xampp\htdocs\project\Slim\Slim.php(1357): Slim\Route->dispatch()
4 C:\xampp\htdocs\project\Slim\Middleware\Flash.php(85): Slim\Slim->call()
5 C:\xampp\htdocs\project\Slim\Middleware\MethodOverride.php(92): Slim\Middleware\Flash->call()
6 C:\xampp\htdocs\project\Slim\Middleware\PrettyExceptions.php(67): Slim\Middleware\MethodOverride->call()
7 C:\xampp\htdocs\project\Slim\Slim.php(1302): Slim\Middleware\PrettyExceptions->call()
8 C:\xampp\htdocs\project\index.php(19): Slim\Slim->run()
9 {main} 

EDIT2：现在我知道，这是对这个问题的 json_en code ，因为它给我的错误： JSON_ERROR_UTF8 当我使用 json_last_error（）。到了那一刻我解决不了它。

Now I know that the problem it's on the json_encode because it gives me the error: JSON_ERROR_UTF8 when I use json_last_error(). By the moment I couldn't solve it.

推荐答案

改变

$app->response->headers->set("Content-type","application/json");
$app->response->status(200);
$app->response->body(json_encode($users));

要

header("HTTP/1.1 200");
header("Content-Type:application/json; charset=utf-8");
echo json_encode($users);

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