accessing a class from another class

Question

I have an idea which requires loading in another class. Let's say I have index.php that includes once (database.php). In a class, is it acceptable to create a new object that is not extended by the class? In otherwords, brining in the content globally instead? Here's what I mean...

index.php:
----------------------
include_once ('./core/dataAccess.php');

....

class home {
    private function getUsers() {
        $dataAccess = new DataAccess();
    }
}

Of course this is acceptable!

dan-lee
– dan-lee

2013-02-15 16:58:53 +00:00
Commented Feb 15, 2013 at 16:58 — dan-lee
– dan-lee, Commented Feb 15, 2013 at 16:58
No, it is not acceptable.

tereško
– tereško

2013-02-17 10:48:00 +00:00
Commented Feb 17, 2013 at 10:48 — tereško
– tereško, Commented Feb 17, 2013 at 10:48

Fabian Schmengler · Accepted Answer · 2013-02-15 17:05:39Z

2

It's acceptable and widely used practice, however it is in most cases not the best solution. The advanced way is using dependency injection, which means that any other objects needed by your class will be " injected" from the outside, making them interchangeable. This could happen in the constructor, in a setter method or directly as parameter where they are needed.

The only methods that use the new keyword are then factory methods that do nothing else than creating objects.

answered Feb 15, 2013 at 17:05

Fabian Schmengler

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