object references.

atmorell

Hello.

How do I pass an object across pages? Reload, refresh etc.

My test page creates object A:
$A = new A();

Object A creates Object B and Object C from the constructor method:
//constructor.
function A() {
$B = new B();
$C = new C();
}

I would like to keep everything that is stored in object A, B and C when I reload or refresh my page. The reason I want this, is because I store many variables inside the objects. Is this possible? I tried with new & A(): etc. but each time my page is reloaded from a form everything is gone. Object A is created at the top at the page.

Best regards.
Asbjørn Morell.

bogu

U can pass variables value across pages; reload, refresh etc.; only by using sessions or cookies, or send them through POST or GET ...

atmorell

So how do I make my object persistent?

bogu

Read my post above and check the php manual u can find it in here ...

jdorsch

You don't make objects persistant since HTML, and therefore PHP, are stateless. You can use hacks like serializing the object into a session variable, but that can be buggy and sometimes slower than recreating the object. Its best to think through what you are doing and try to work through the issue within these limitations. Its ok to recreate an object on each page load assuming its not doing a ton of database queries. You could also dump the contents of the object into an array, save that to a session, then recreate the object through a constructor or factory. If you describe the probem further along with how you are using this object and what you are storing, you could get some further help.

atmorell

Well I am trying to figure out the best way to design php applications. Object A uses B and C to perform certain task. A = cars, B = engines and C = engine parts. When I choose a car, B and C fetch data about the car and store id, names etc in variables inside the B and C objects. I just liked the idea that when I have created my object once I could continue using data from objects A, B and C across pages. Delete, create forms, show etc. I guess I have to put each ID in a session and fetch everything when a page is loaded :/

jdorsch

Yes, that is what you are going to have to do. One thing you can do though is use lazy instantiation using singletons so that the data for B and C is only retrieved when needed. Just passing the carID around though is the way to go.