Can't register a singleton with a SoapClient in the constructor

[MarianNapi]

• Laravel Version: 7.14.1
• PHP Version: 7.3.18

I've created a new ServiceProvider and added it to the app.php. I then registered a singleton with a test class which has a SoapClient in it's constructor:

$this->app->singleton( Test::class, function () { return new Test(new SoapClient(null)); } );

I then get this error when trying to get the class like this:

app(Test::class)

Illuminate\Contracts\Container\BindingResolutionException : Unresolvable dependency resolving [Parameter #0 [ $wsdl ]] in class SoapClient

It doesn't matter wether I use null or a real wsdl as SoapClient parameter, the error stays the same.

[driesvints]

Moving to discussions

[mfn]

Because the SoapClient constructor requires the WSDL, see https://www.php.net/manual/en/soapclient.construct.php

[t-heuser]

No, this is not true. The parameter can also be null, as seen here.
But as @MarianNapi wrote:

It doesn't matter wether I use null or a real wsdl as SoapClient parameter, the error stays the same.

So he even tried it with a real WSDL, but he still gets the same error.

Does the problem perhaps arise from the fact that the paramter $wsdl is of the type mixed and laravel cant resolve that correctly?

[mfn]

Good catch!

Then the only other reason I can think of is that the registration is not properly picked up, because it would only try auto-wiring if it can't find an explicit bind, which however was given.

• is Test::class referring to the same class, i.e. is the import correct?
• Is it a deferred provider and maybe provides isn't set up correctly?

[MarianNapi]

When using the GuzzleClient in the Test class and then registering the class with
$this->app->singleton( Test::class, function () { return new Test(new Client()); } );
it's working completely fine - so I don't think the import is the problem.

The provider doesn't implement the DeferrableProvider so as far as I understood the docs the provides method isn't needed here