How to call object property as method?

No, because that's not a method. There is nothing dynamic in what you've shown, you can call it simply like:

$objA = new ObjA;

$objA->appPath;

or define a function

class ObjA
{
    public function appPath() {}
}

Then call it as you've shown.

Ok. Then how does @mixin comment work? Like in the Router Registrar work?

@thavarshan can you give some code to what you are referring, url to the source code?

<?php

namespace Illuminate\Routing;


/**
 * @method \Illuminate\Routing\Route get(string $uri, \Closure|array|string|null $action = null)
 * @method \Illuminate\Routing\Route post(string $uri, \Closure|array|string|null $action = null)
 * @method \Illuminate\Routing\Route put(string $uri, \Closure|array|string|null $action = null)
 * @method \Illuminate\Routing\Route delete(string $uri, \Closure|array|string|null $action = null)
 * @method \Illuminate\Routing\Route patch(string $uri, \Closure|array|string|null $action = null)
 * @method \Illuminate\Routing\Route options(string $uri, \Closure|array|string|null $action = null)
 * @method \Illuminate\Routing\Route any(string $uri, \Closure|array|string|null $action = null)
 * @method \Illuminate\Routing\RouteRegistrar as(string $value)
 * @method \Illuminate\Routing\RouteRegistrar domain(string $value)
 * @method \Illuminate\Routing\RouteRegistrar middleware(array|string|null $middleware)
 * @method \Illuminate\Routing\RouteRegistrar name(string $value)
 * @method \Illuminate\Routing\RouteRegistrar namespace(string $value)
 * @method \Illuminate\Routing\RouteRegistrar prefix(string  $prefix)
 * @method \Illuminate\Routing\RouteRegistrar where(array  $where)
 */
class RouteRegistrar

So that class is extended by the Illuminate\Routing\Router class which then uses the Macroable trait in which the method mixin is defined. So again that's a method not a property.

And in the RouteRegistrar class you can see the __call method which acts whenever a method that does not exists on the parent class propagates the call to the child classes which in this case is as I said above the Router class that has the mixin method. I hope it is a bit more clear now.

Oh thank you so much. I've been searching for this information all over. Thank you!!!

Do you have any tips on how I can make my own Macroable trait?

You can probably follow the Laravel source code to do that, I really don't know your needs in order to help you more.

Yeah I've been trying to but for my understanding the Laravel code base is really complicated.

I'm basically trying to acheive the fluent routing thing that's being implemented on the Laravel router.

Another instance is in the RouteServiceProvider,

Route::middleware('web')
             ->namespace($this->namespace)
             ->group(base_path('routes/web.php'));

specifically this part,

->namespace($this->namespace)

I don't understand how the namespace is being set through the UrlGenerator and the controller actions are being formatted to incorporate the full namespace.

I believe the Builder pattern is used there, so you can take a look at that design pattern. Mainly you will need to check what the previous method returns, in your example above, you need to check what does Route::middleware('web') returns, that's where the namespace method exists so the call can be chained.

Brilliant! Thanks again!