Update ServiceMap.php

[daniellz]

fix: correct FQCN retrieval in getServiceClassFromNode method

In the getServiceClassFromNode method, replaced the usage of $node->class->getFirst() with $node->class->toString() to correctly retrieve the full class name (FQCN). This fix ensures proper handling of fully qualified class names in class constant fetches.

[erickskrauch]

Can you please provide some code samples to understand, which case it covers? You can just send the code in a reply, no need to try to invent a test.

[daniellz]

Can you please provide some code samples to understand, which case it covers? You can just send the code in a reply, no need to try to invent a test.

For cases where we have FQCN as keys in the DI config, like:

$config['container']['definitions'][Client::class] => function ($container, $params = [], $config = []) : Client
{
    //some params preparations
    return new Client($params);
}

And before fix we get error on this code:

$client = Yii::$container->get(Client::class);
$res = $client->get($url);

phpstan: Call to an undefined method object::get().

[erickskrauch]

@daniellz, thanks for this PR :)