PHP Dependency Injection in Practice: Resolving the 'Too Few Arguments' Fatal Error in Controllers

Injecting the Request object via the constructor in a PHP MVC architecture is an elegant practice, but it often leads to the 'Too few arguments to function __construct()' fatal error. This article dives into the root cause of this issue—typically found in the router's object instantiation logic—and provides clear, actionable solutions to help you master the core principles of dependency injection and write cleaner, more robust code.