Default Configuration like outputBuffering, displayErrorDetails not working in slim 3 php framework

Question

I am using slim version 3.8 and I want to disable outputBuffering and show all errors: Following is my simple Hello World program.

require_once(dir.'/vendor/autoload.php');

$configuration = [
    'settings' => [
        'displayErrorDetails' => true,
        'outputBuffering' => false,
    ],
];

$app = new \Slim\App($configuration);

// Add route callbacks
$app->get('/', function ($request, $response, $args) {
    echo "here";
    return $response->withStatus(200)->write('Hello World!');
});

// Run application
$app->run();

If I comment out echo "here"; then it works fine. But this code is throwing exception - 500 internal error saying that "Unexpected data in output buffer. Maybe you have characters before an opening". Can someone please tell me what's going wrong here?

If you are using an framework, you are forced to do it like the framework wants. But to answer your question: In a framework you will NOT echo stuff by yourself. You have to use methods like `write()` for that. If you echo stuff and the framework tries to set an `header()` after that, it fails `Unexpected data in output buffer` http://stackoverflow.com/questions/2832010/what-is-output-buffering. That it. — JustOnUnderMillions, Apr 28 '17 at 11:26

score 1 · Answer 1 · answered May 04 '17 at 06:17

It's working as intended. You need to add addContentLengthHeader => false to your settings key in $configuration.

Setting outputBuffering to false means that the response object doesn't know about any data you echo out. Therefore, when it comes to automatically add the content-length header, it notices a mis-match and you get the "Unexpected data in output buffer" error. Hence, you need to disable automatically setting the content-type header.

Default Configuration like outputBuffering, displayErrorDetails not working in slim 3 php framework

1 Answers1