PHP - SLIM API - howto share variables across multiple PHP files but request specific

Hey,

I encountered a similar requirement during the development of my project using SLIM API. In order to share variables across multiple PHP files but maintain request-specific values, I employed a different approach utilizing the SLIM container.

The container is a dependency injection container provided by SLIM, which allows you to register and retrieve values across different parts of your application. It acts as a centralized storage for variables that can be easily accessed whenever needed.

To get started, you can initialize the container in your main API file, like this:

php
<?php

use DI\Container;

use Slim\Factory\AppFactory;



require 'vendor/autoload.php';



// Create the container

$container = new Container();



// Register your variables in the container

$container->set('authToken', function () {

    // Logic to generate auth token

    return 'your_auth_token';

});



$container->set('config', function () {

    // Logic to retrieve configuration settings

    return [

        'setting1' => 'value1',

        'setting2' => 'value2'

    ];

});



// Create the Slim app

$app = AppFactory::createFromContainer($container);

?>

php
<?php

use Psr\Http\Message\ResponseInterface as Response;

use Psr\Http\Message\ServerRequestInterface as Request;



$app->get('/example', function (Request $request, Response $response) {

    // Access the variables from the container

    $authToken = $this->get('authToken');

    $config = $this->get('config');



    // Use the variables in your logic

    // ...

});

?>

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Hey there,

I faced a similar situation while working with SLIM API and found a solution using middleware. Middleware in SLIM allows you to intercept and modify the request/response objects before they reach the route handlers. This provides a great opportunity to share variables specific to each request.

What I did was create a custom middleware that initializes the required variables and assigns them to the request object. This ensures that each request has its own set of variables, which are independent of other requests.

To implement this, you can create a PHP file, let's say "CustomMiddleware.php", which contains the logic for initializing the variables. Then, in your main API file, you can include and use this middleware like so:

php
<?php

// Include the CustomMiddleware file

require 'CustomMiddleware.php';



use Slim\Factory\AppFactory;



// Create the Slim app

$app = AppFactory::create();



// Add the CustomMiddleware to the app

$app->add(new CustomMiddleware());



// Define your API routes and handlers

// ...



// Run the app

$app->run();

?>

php
<?php

use Psr\Http\Message\ResponseInterface as Response;

use Psr\Http\Message\ServerRequestInterface as Request;



class CustomMiddleware

{

    public function __invoke(Request $request, Response $response, $next)

    {

        // Initialize and assign your variables here

        $authToken = ''; // Example auth token

        $config = []; // Example configuration settings



        // Assign the variables to the request object

        $request = $request->withAttribute('authToken', $authToken);

        $request = $request->withAttribute('config', $config);



        // Call the next middleware

        $response = $next($request, $response);

        return $response;

    }

}

?>

php
<?php

use Psr\Http\Message\ResponseInterface as Response;

use Psr\Http\Message\ServerRequestInterface as Request;



// Example route handler

$app->get('/example', function (Request $request, Response $response) {

    // Access the variables from the request object

    $authToken = $request->getAttribute('authToken');

    $config = $request->getAttribute('config');



    // Use the variables in your logic

    // ...

});

?>

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