Can't understand a logic of Object And Array in php

Question

If I write this line on routes/web.php file

dd( app()['config']["auth.guards.web"] );

It outputs this:

array:2 [▼
  "driver" => "session"
  "provider" => "users"
]

That's cool, but my question is since app()['config'] returns an object so how this ["auth.guards.web"]works? Even there is no index with that name!

Outside of Laravel I tried to write a class named Test so that it returns the same output but I got an error! Which is,

Fatal error: Uncaught Error: Cannot use object of type Test as array

Can anyone explain it with core php?

The object returned by app()['config'] probably implements ArrayAccess — Phil
– Phil, Commented Oct 19, 2020 at 1:46

cednore · Accepted Answer · 2020-10-19 01:55:46Z

3

Laravel contains a very useful helper function called Arr::get() which retrieves a value from a deeply nested array using "dot" notation. Laravel framework uses this helper function everywhere it needs to get the values inside a deep array; e.g configs and translation and so on.

Example;

config('database.driver');
__('validation.error');
trans('validation.error');

On the other hand, app()['config'] returns Illuminate\Config\Repository instance which implements ArrayAccess. As long as get method of Illuminate\Config\Repository class uses Arr::get method, you can use "dot" notated array access along with app()['config'].

For more details, see these links; https://laravel.com/docs/8.x/helpers#method-array-get https://github.com/laravel/framework/blob/8.x/src/Illuminate/Config/Repository.php#L53

edited Oct 19, 2020 at 1:55

answered Oct 19, 2020 at 1:46

cednore

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1 Comment

Anisur Rahman Over a year ago

I got it, ArrayAccess is a php's predefined interface and it provides accessing objects as an array. Thank you.

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