Most often WordPress developers uses manual file loading by just typing require_once all the time. But this approach is not good for all cases. There is few moments which you should to know: — Load each file manually. But what if you have over 400 files or more? — Your code contains the logic of loading files. And you probably doing more work by designing this logic of loading files. — Some methods and classes may missed (loaded too later). — One more node for testing. You need to make sure that your loaders work as intended. The good news — you can use autoloaders and this is not required something special. And this keynote about autoloaders and Composer.

1. Автозагрузка в PHP
WordPress Meetup #44
15 апреля 2017 Москва, Setka

2. Как было раньше
Примеры. Минусы и недостатки
Как надо делать
Современный мир и решение проблем
Практика
Сложные и не очень примеры

3. Ручная загрузка

4. function hello_dolly_get_lyric() {
/** These are the lyrics to Hello Dolly */
$lyrics = "Hello, Dolly
Well, hello, Dolly
It's so nice to have you back where you belong
You're lookin' swell, Dolly
I can tell, Dolly
You're still glowin', you're still crowin'
You're still goin' strong
We feel the room swayin'
While the band's playin'
One of your old favourite songs from way back when
So, take her wrap, fellas
Find her an empty lap, fellas
Dolly'll never go away again
Hello, Dolly
Well, hello, Dolly
It's so nice to have you back where you belong
You're lookin' swell, Dolly
I can tell, Dolly
You're still glowin', you're still crowin'
You're still goin' strong
We feel the room swayin'
While the band's playin'
One of your old favourite songs from way back when
Golly, gee, fellas
Find her a vacant knee, fellas

5. /**
* Implement the Custom Header feature.
*/
require get_parent_theme_file_path('/inc/custom-header.php');

6. $authentic_includes = array(
'/lib/init.php', // Initial Theme Setup
'/lib/plugins.php', // List of Required Plugins
'/lib/dashboard.php', // Dashboard Functions
'/lib/options.php', // Options
'/lib/theme-mods.php', // Theme Mods
'/lib/custom-fields.php', // Custom Fields
'/lib/template-tags.php', // Functions
'/lib/assets.php', // Theme Assets
'/lib/gallery.php', // Gallery
);
foreach ($authentic_includes as $file) {
include_once get_template_directory() . $file;
}

7. $functions = scandir(get_template_directory() . '/functions/');
foreach ($functions as $key => $function) {
if ( $function != '.' && $function != '..' ) require_once
get_template_directory() . '/functions/' . $function;
}

10. Зачем нужна автозагрузка?
1.Любой код (файл) доступен в любое время.
2.Меньше логики.
3.Универсальность.
4.Совместимость с другими проектами.
5.Меньшая вероятность коллизий.
6.Лучшая структура и красивые имена.

11. require_once 'vendor/autoload.php';

12. Использование

13. • Classmap ~ WordPress
• PSR-4 ~ Symfony
• Отдельные файлы с функциями ~ Twig

14. {
"name": "symfony/validator",
"type": "library",
"autoload": {
"psr-4": {
"SymfonyComponentValidator": ""
}
}
}
composer.json

16. Пример из мира
WordPress

18. Коля Коробочкин
WordPress разработчик
korobochkin@setka.io