On 01/09/2021 19:33, ourdiaspora wrote:
Line 8 refers to another file with the key word 'use', but a user
contributor comment to the php manual
(https://www.php.net/manual/en/language.namespaces.php) states there
are two possible applications?
`use` (in this case) refers not (directly) to a filename or path, but a
namespace. In the vast majority of cases, you'll find these are set up
using Composer's built-in autoloader, so checking the project
composer.json will give you the "root" of the namespace. From there you
can basically follow the directory structure.
This behavior is defined in PSR-4: https://www.php-fig.org/psr/psr-4/
You can read more on autoloading in the manual:
https://www.php.net/manual/en/language.oop5.autoload.php
It's possible to specify custom autoloading schemas, and Composer
supports other autoloading methods (
https://getcomposer.org/doc/04-schema.md#autoload ) but PSR-4 is by far
the most common.
The other place you'll see the `use` keyword used is with anonymous
functions to inherit variables from the parent scope:
https://www.php.net/manual/en/functions.anonymous.php#example-163
The 2 usages are quite distinct and not easy to confuse (the former is
almost always at the top of the file, the latter is always in a function
declaration)
Line 6 of the next file (https://framagit.org/hubzilla/core/-/blob/master/Zotlabs/Lib/Libsync.php) refers to keyword 'use' some object 'App'; where to find that???
The class `App` has been defined in the `boot.php` file in the root of
the project: https://framagit.org/hubzilla/core/-/blob/master/boot.php
(Since the `App` class is in the root (`\`) namespace I found it by
starting from the "index.php" in the project root and found the boot.php
included by Zotlabs\Web\Webserver)
