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| Author |
How to store objects in array and the retrieve them
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| 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.
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| "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 2004-08-20, 4:33 am |
| 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: http://www.php.net/references
-- brion vibber (brion @ pobox.com)
| |
|
| Brion Vibber wrote:
> J.P. wrote:
>
>
>
> 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: http://www.php.net/references
>
> -- 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.
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| steve wrote:
> "J.P." wrote:
> is
>
> 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.
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