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List:       php-general
Subject:    Re: Namcspaces and include()
From:       Denis Romanenko <deromanenko () gmail ! com>
Date:       2022-07-28 4:29:26
Message-ID: 1ea230dc-6fe8-f365-3124-79a3ddde35cd () gmail ! com
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You right, Namespaces do not provide you autoimport of your code, like 
in Python or JS with their import Something from '/src/some/thing' which 
is just a file path.

Namespaces intended in PHP just to avoid name collisions in class and 
function names.

At the end of the day (runtime) your PHP code will be assembled in one 
big file, which will be executed by PHP engine (in simple words).

and you still need to import everything in this chunk of code. So here 
we use Namespaces to avoid collisions in names from different packages 
and file.

But wise folks invent autoloading:

https://stackoverflow.com/questions/1830917/how-do-i-use-php-namespaces-with-autoload

https://www.php.net/manual/en/language.oop5.autoload.php

And, of course, composer.

And it becomes a good practice to put php file in folder 
"App/Http/Controllers/Big.php" with namespace "use App\Http\Controllers"

But in fact there is no strict required to really put files with this 
namespace in this folder on your filesystem.


28.07.2022 11:11, paulf@quillandmouse.com пишет:
> Folks:
>
> I've been coding in PHP for almost two decades, but I've never used
> namespaces in my code. Please verify or correct my understanding of how
> namespaces work with include() or require().
>
> In order for a namespace declared at the top of a file to actually be
> of any use, the code file which defines the namespace originally must
> be included somewhere in a file before the namespace declare. That is,
>
> file1.php:
> <?php
> namespace \something
> // some code which is used in other files
>
> file2.php:
> <?php
> namespace \something
> // the code which uses the namespaced code
>
> file3.php:
> <?php
> include 'file1.php';
> // include this before using the namespace code elsewhere
>
> In other words, the fact of declaring a namespace does not pull in that
> code from elsewhere. You must do an include() or require() somewhere in
> order to actually use the namespaced code.
>
> I know, this sounds like a really dumb newbie question. Mea culpa.
>
> Paul
>
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