I am new to Drupal web development. I have already used Wordpress platform by building a custom plugin to write custom php functions, and calling the function from a custom page was easy.
example:
<?php
function givenumber(){
return 50;
}
?>;
Which I call by using:
<?php echo givenumber(); ?>
Please help.
The best way to do this in Drupal 8 is to create a service in a custom module yes.
Create a module with the following structure:
your_custom_module/
├── your_custom_module.info.yml
├── your_custom_module.services.yml
└── src/
└── YourCustomService.php
Your your_custom_module.services.yml file:
services:
your.custom.service:
class: Drupal\your_custom_module\YourCustomService
Your Service class:
<?php
namespace Drupal\your_custom_module;
class YourCustomService {
public function giveNumber() {
return 1234;
}
}
Enable the module and you can now call this service:
\Drupal::service('your.custom.service')->giveNumber();
See more details in Structure of a service file
\Drupal::service('your.custom.service')->giveNumber();
There is 'N' number of ways. And, it depends on your use case.
If you want some custom value and just show in your content page. There are hook_preprocess_node() functions that you can write in your active theme, and make some variables available to your twig file.
