How to store objects in array and the retrieve them

[J.P.]

Hi,

I'm trying to store objects in an array and then later I want to
retrieve the object again. I tried it the following way, but it doesn't
work.

$items = array();
$newItem = new Item();
array_push($items, $newitem);

$retrievedItem = $items[0];
$retrievedItem->display();

Now I get the message:

Fatal error: Call to undefined function: display() in ...

So $retrievedItem is not of class Item. How can I retrieve it so it is
an object of class Item?

J.P.

[steve]

"J.P." wrote:

> Hi,
>
> I’m trying to store objects in an array and then later I want to
>
> retrieve the object again. I tried it the following way, but it
> doesn’t
> work.
>
> $items = array();
> $newItem = new Item();
> array_push($items, $newitem);
>
> $retrievedItem = $items[0];
> $retrievedItem->display();
>
> Now I get the message:
>
> Fatal error: Call to undefined function: display() in ...
>
> So $retrievedItem is not of class Item. How can I retrieve it so it

is

>
> an object of class Item?
>
> J.P.

There may be a better solution, but you can always serialize the
object (see php doc).

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[Brion Vibber]

J.P. wrote:

> I'm trying to store objects in an array and then later I want to
> retrieve the object again. I tried it the following way, but it doesn't
> work.
>
> $items = array();
> $newItem = new Item();
> array_push($items, $newitem);

If this is your exact code, it's going to fail because variable names
are case sensitive. You're pushing an uninitialized variable, hence a
NULL value.

When copying objects around you may also want to make sure you
understand the awful issue of references: [url]http://www.php.net/references[/url]

-- brion vibber (brion @ pobox.com)

[J.P.]

Brion Vibber wrote:

> J.P. wrote:
>

>> I'm trying to store objects in an array and then later I want to
>> retrieve the object again. I tried it the following way, but it
>> doesn't work.
>>
>> $items = array();
>> $newItem = new Item();
>> array_push($items, $newitem);

>
>
> If this is your exact code, it's going to fail because variable names
> are case sensitive. You're pushing an uninitialized variable, hence a
> NULL value.
>
> When copying objects around you may also want to make sure you
> understand the awful issue of references: [url]http://www.php.net/references[/url]
>
> -- brion vibber (brion @ pobox.com)

No, this isn't my exact code. I'm quite new to PHP, but not to
programming. But I figured my problem out. Programming OOP in PHP is
slightly different than in p.e. Java.
Thanks anyway.

J.P.

[J.P.]

steve wrote:

> "J.P." wrote:

> > Hi,
> >
> > I’m trying to store objects in an array and then later I want to
> >
> > retrieve the object again. I tried it the following way, but it
> > doesn’t
> > work.
> >
> > $items = array();
> > $newItem = new Item();
> > array_push($items, $newitem);
> >
> > $retrievedItem = $items[0];
> > $retrievedItem->display();
> >
> > Now I get the message:
> >
> > Fatal error: Call to undefined function: display() in ...
> >
> > So $retrievedItem is not of class Item. How can I retrieve it so it

> is

> >
> > an object of class Item?
> >
> > J.P.

>
> There may be a better solution, but you can always serialize the
> object (see php doc).
>

Serialization is indeed an option, but I could not use it here. But
after a few hours i figured it out. The problem was somewhere else.
Thanks anyway.

J.P.