找不到页面（Slim Framework）

Question

<?php
use \Psr\Http\Message\ServerRequestInterface as Request;
use \Psr\Http\Message\ResponseInterface as Response;

require '../vendor/autoload.php';
require '../src/config/db_standings.php';

$app = new \Slim\App;

require '../src/routes/ppg.php';

require '../src/routes/standings.php';

$app->run();

So this is my index.php file and I don't understand why is it behaving the way that it only loads the last required route. In this case only standings.php . Whatever route I add last it only loads the last route and other pages are not found. What am I doing wrong?

standings.php

<?php

Header('Content-Type: application/json; charset=UTF-8');

use \Psr\Http\Message\ServerRequestInterface as Request;
use \Psr\Http\Message\ResponseInterface as Response;

$app = new \Slim\App;

$app->get('/api/standings', function(Request $request, Response $response){
    $sql = "SELECT * FROM standings";

    try {
        $db = new db_standings();
        $db = $db->connect();

        $stmt = $db->query($sql);
        $standings = $stmt->fetchAll(PDO::FETCH_OBJ);
        $db = null;

        $json = json_encode($standings, JSON_UNESCAPED_UNICODE);

        echo($json);

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

ppg.php

<?php

Header('Content-Type: application/json; charset=UTF-8');

use \Psr\Http\Message\ServerRequestInterface as Request;
use \Psr\Http\Message\ResponseInterface as Response;

$app = new \Slim\App;

$app->get('/api/ppg', function(Request $request, Response $response){
    echo 'BANANAS';
});

Answer 1

In index.php you are creating Slim application instance and put it in $app variable:

<?php

$app = new \Slim\App; # This is new Slim app contained in $app variable

// executing code of standings.php...
// executing code of ppg.php...

$app->run(); # Here you run the application that is contained in $app variable.

But you do the same thing in each included file: standings.php and ppg.php .

So, when you include standings.php , you overwrite content of the $app variable, add routes that are declared in the file.

Then you include ppg.php that overwrites $app instance (and, consequently, the routes that had been declared) and appends its routes.

When the flow of execution returns to index.php , it runs $app->run() and that $app happens to be the one created in the last file included.

Thus to fix the problem, simply remove this line

$app = new \Slim\App;

from all files but index.php .

UPDATE

In comments you wrote

After removing the unnecessary and changing JSON output method I get "Slim Application Error - sorry for the temporary inconvenience"

Okay, the reason for that is because you're doing it wrong, excuse me for being too harsh.

In essence, Slim application is a set of callbacks appended to specific routes.

Generally each callback accepts two arguments: request and response object, and each migh (or might not for some reason) change request and response to whatever you want. All callbacks are invoked one after another, in a chain.

The rule is simple: any callback should return response object in the end . And that response may be anything: html document, json data, a file - whatever can be returned in HTTP response.

Therefore in your Slim application if you're doning something like

header('Content-Type: application/json; charset=UTF-8');

or

echo $jsonString;

then you're doing it wrong. Instead of setting response header and outputting JSON directly, you should build Response object that has that header and contains your data in body . Slim is excellent at that, take a look (I've simplified your code a bit for better abstraction):

<?php

use \Psr\Http\Message\ServerRequestInterface as Request;
use \Psr\Http\Message\ResponseInterface as Response;

$app = new \Slim\App;

// Append callback to a route: note request response arugments.
$app->get('/api/standings', function(Request $request, Response $response) {

    $standingsRepository = new \StandingsRepository;

    $standings = $standingsRepository->getAll();

    if ($standings) {
    // Return response object
        return $response->withJson($standings);
    } else {
        // Or pass to another callback: note request and response
    return new \Slim\Exception\NotFoundException($request, $response);
    }

});

Here we used withJson method of Response object. This sets application/json header to your response and puts in body whatever you pass as argument. In our case it's value of $standings variable (I assume it's an array of objects).

I hope I made things a bit more clear for you. I strongly suggest to read framework documentation , it will take you one evening and two cups of coffee and save you so much time.

Answer 2

As suggested by @Georgy Ivanov in the below answer you have to remove following block from standings.php and ppg.php:

Header('Content-Type: application/json; charset=UTF-8');

use \Psr\Http\Message\ServerRequestInterface as Request;
use \Psr\Http\Message\ResponseInterface as Response;

$app = new \Slim\App;

In addition, since your intention is to output a JSON response you can simply to that by using Slim's withJson() method:

return $response->withJson($standings);

refer to this https://www.slimframework.com/docs/objects/response.html#returning-json