Explanation Dependency Injection
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1 When should I use dependency injection?
You should use dependency injection when you want to have control over which dependencies you class/method will use at runtime. The best example of this is when you might want to replace a dependency that accesses a database with one that uses memory for unit testing purposes.
2 Why should I use it?
It makes your code more testable, more flexible and more extensible.
3 What does in it easy words ? How is it working?
It usually works by passing dependencies as parameters to a method or to a class's constructor.
4 Is it like creating a factory for recycling your code/scripts?
No. See 1.
5 How does it interact and how do I call it when I use a front-controller ( For example )?
Whatever creates the class or calls the method will need to satisfy that class/method's dependencies. This might be as simple as 'newing' up a object or getting a IoC framework to wire it all up for you.
Basically by using dependency injection, you will get rid of static dependencies. Eg framework or w/e will handle dependencies for you. Its desing pattern used to prevent loose coupling and similar issues.
For more detailed info try wiki.
Regards Inty
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