Implementing a Real-World Feature Across Drupal, Symfony, and Laravel

Feature: E-Commerce “Discount Code Validator”

Requirement:

• When a user applies a discount code during checkout:
  • Validate the code
  • Check expiration and usage limits
  • Calculate discount
  • Return an updated order total
• Must be extensible for future promotion types

This feature is small but touches services, events, plugins, and DI—perfect for comparing modular approaches.

Universal “Soldier” in PHP

Dependency Injection Without Pain (Symfony, Laravel, Drupal)

In the first article, we covered the controller as a universal entry point into any modern PHP framework.
Now it’s time for the next critical step — Dependency Injection (DI).

Many developers fear DI because:

• “There’s too much magic”
• “I don’t understand where objects come from”
• “In Drupal it’s a nightmare”

The good news is simple: