PHP-DI: Routes and optional segments

Question

I am using PHP-DI with the Slim framework. In Slim you make a route segment optional by putting brackets around it. Now that I have set up PHP-DI when I leave out the optional route segment, I get this error:

Type: Invoker\Exception\NotEnoughParametersException
Message: Unable to invoke the callable because no value was given for parameter 1 ($limit)

Here is my route:

$app->get('/api2/products[/{limit}]', ['\App\Controllers\SampleProductController', 'show']);

I can't find anything in the PHP-DI docs that talk about the optional part, just how to get the value of a named segment.

Answer 1

PHP-DI author here. This is a bug :)

This is something I fixed not so long ago here: #521 But it seems I didn't apply the same logic everywhere (for example in the Invoker package, which is used by all the framework integrations).

I have opened #562 to track this bug, have a look at it for more information.

In the meantime as a workaround you can indeed move the parameter to the end of the method as suggested in the comments.