PHP PUT method Slim framework

Question

May I ask why the put contains only an empty field? While the post is working normally?

$app->post('/books', function (Request $request, Response $response, $args){
    $book = Books::fromResultSet($request->getParsedBody());
    if($book->valid())
        return $response->withStatus(400);

    $book->insert();
    return $response->withStatus(201);
})->add($securityMiddleware);

$app->put('/books/{id}', function (Request $request, Response $response, $args){
    $book = Books::fromResultSet($request->getParsedBody());
    print_r($book);

    /*if($book->valid())
        return $response->withStatus(400);

    $book->update();
    return $response->withStatus(201);*/
})->add($securityMiddleware);

Errors after listing print_r ($ request-> getParsedBody ())

C:\MAMP\htdocs\vendor\slim\slim\Slim\Handlers\Strategies\RequestResponse.php(43): {closure}(Object(GuzzleHttp\Psr7\ServerRequest), Object(GuzzleHttp\Psr7\Response), Array)
    #1 C:\MAMP\htdocs\vendor\slim\slim\Slim\Routing\Route.php(384): Slim\Handlers\Strategies\RequestResponse->__invoke(Object(Closure), Object(GuzzleHttp\Psr7\ServerRequest), Object(GuzzleHttp\Psr7\Response), Array)
    #2 C:\MAMP\htdocs\public\index.php(27): Slim\Routing\Route->handle(Object(GuzzleHttp\Psr7\ServerRequest))
    #3 C:\MAMP\htdocs\vendor\slim\slim\Slim\MiddlewareDispatcher.php(313): {closure}(Object(GuzzleHttp\Psr7\ServerRequest), Object(Slim\Routing\Route))
    #4 C:\MAMP\htdocs\vendor\slim\slim\Slim\MiddlewareDispatcher.php(81): class@anonymous->handle(Object(GuzzleHttp\Psr7\ServerRequest))
    #5 C:\MAMP\htdocs\vendor\slim\slim\Slim\MiddlewareDispatcher.php(81): Slim\MiddlewareDispatcher->handle(Object(GuzzleHttp\Psr7\ServerRequest))
    #6 C:\MAMP\htdocs\vendor\slim\slim\Slim\Routing\Route.php(341): Slim\MiddlewareDispatcher->handle(Object(GuzzleHttp\Psr7\ServerRequest))
    #7 C:\MAMP\htdocs\vendor\slim\slim\Slim\Routing\RouteRunner.php(84): Slim\Routing\Route->run(Object(GuzzleHttp\Psr7\ServerRequest))
    #8 C:\MAMP\htdocs\vendor\slim\slim\Slim\Middleware\RoutingMiddleware.php(59): Slim\Routing\RouteRunner->handle(Object(GuzzleHttp\Psr7\ServerRequest))
    #9 C:\MAMP\htdocs\vendor\slim\slim\Slim\MiddlewareDispatcher.php(147): Slim\Middleware\RoutingMiddleware->process(Object(GuzzleHttp\Psr7\ServerRequest), Object(Slim\Routing\RouteRunner))
    #10 C:\MAMP\htdocs\vendor\slim\slim\Slim\Middleware\ErrorMiddleware.php(107): class@anonymous->handle(Object(GuzzleHttp\Psr7\ServerRequest))
    #11 C:\MAMP\htdocs\vendor\slim\slim\Slim\MiddlewareDispatcher.php(147): Slim\Middleware\ErrorMiddleware->process(Object(GuzzleHttp\Psr7\ServerRequest), Object(class@anonymous))
    #12 C:\MAMP\htdocs\vendor\slim\slim\Slim\MiddlewareDispatcher.php(81): class@anonymous->handle(Object(GuzzleHttp\Psr7\ServerRequest))
    #13 C:\MAMP\htdocs\vendor\slim\slim\Slim\App.php(215): Slim\MiddlewareDispatcher->handle(Object(GuzzleHttp\Psr7\ServerRequest))
    #14 C:\MAMP\htdocs\vendor\slim\slim\Slim\App.php(199): Slim\App->handle(Object(GuzzleHttp\Psr7\ServerRequest))
    #15 C:\MAMP\htdocs\public\index.php(85): Slim\App->run()
    

Answer 1

Refer from document .

It's very common in web APIs to send data in JSON or XML format. Out of the box, PSR-7 implementations do not support these formats, you have to decode the Request object's getBody() yourself. As this is a common requirement, Slim 4 provides BodyParsingMiddleware to handle this task.

After your $app = AppFactory::create(); , add this code.

// Parse json, form data and xml
$app->addBodyParsingMiddleware();

And inside your app function. Use $request->getParsedBody() as normal.
Example:

$app->any('/books/{id}', function (Request $request, Response $response, $args){
    print_r($request->getParsedBody());
    return $response;
});

Result:

If this still errors, please try to update Slim 4 to latest version and try again.