note 31228 deleted from language.references by sniper
| From: | sniper@php.net | Date: | Tue, 30 Sep 2003 01:18:55 +0000 |
| Subject: | note 31228 deleted from language.references by sniper | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-57317@lists.php.net to get a copy of this message | ||
Note Submitter: thomas@zuschneid.de
----
I used objects inside objects, like this:
class ItemClass {
function PrintContainerValue() {
print $this->container->value;
}
}
class ContainerClass {
var $value=5;
function ContainerClass(&$item) {
$item->container = &$this;
$this->item = $item;
}
}
$aContainer = new ContainerClass(new ItemClass); // 1
$aContainer->value = 10; // 2
$aContainer->item->PrintContainerValue();
It was a long quest to figure out why this prints 5, not 10.
But the solution is quite simple:
The "new" in line 1 creates a ContainerClass object with value 5 and an item referencing
to this instance.
$aContainer gets only a copy whose "value" is changed in line 2, but item->container
still references the first instance with unchanged "value".
Replacing new with &new solved the problem.