PHP Dependency Injection

Question

I\'m trying to get my head around Dependency Injection and I understand it, for the most part.

However, say if, for some reason, one of my classes was dependent on s

Answer 1

I recommend you to use Singltones or Mutlitones. In these cases you will be always able to get objects via static class' methods.

The other way (couldn't find a correct pattern name, but it could be Registry) is to use one global static object to store multiple objects' instances. E.g. (simplified code, without any checks):

class Registry {
    private static $instances = array();

    public static function add($k, $v) {
        $this->instances[$k] = $v;
    }

    public static function get($k) {
        return $this->instances[$k];
    }
}

class MyClass {
    public function __construct() {
        Registry::add('myclass', $this);
    }
}