PHP: how to reuse code (oop)?

Question

I have studied in php oop and stocked in the concept of reusable code.

I have seen an example like

interface iTemplate
{
    public function setVar         


        

Answer 1

Interfaces are usually useful in cases where you want something to be interchangeable. Imagine you'd build a Plugin aware application. You then have the interface iPlugin:

interface iPlugin {
   public function init();
   /* .. */
}

and all Plugins would implement that interface. A plugin manager could then easily check if a Plugin implements the interface and call the init() method on it.