After quickly looking (I haven't tested this), but I believe you are
passing only a copy of your singleton. I believe you need to add an "&"
in front of your function name to return a reference to the return
value.
-Ryan
> Class UsefulStuff
> {
> function &singleton($class)
> {
> if (!$GLOBALS['__useful_stuff'][$class]) {
> // Add including the class if not done elsewhere
> $GLOBALS['__useful_stuff'][$class] = new $class();
> }
> return $GLOBALS['__useful_stuff'][$class];
> }
> }
On Aug 26, 2004, at 2:54 PM, Peter Bowyer wrote:
> Hi,
>
> I was trying to knock up an example of a singleton, but in the
> following
> example it doesn't print the correct output. Can you spot the problem?
>
> Ta,
> Peter
>
> <?php
>
> Class Display
> {
> var $text = 'Default';
> function Display()
> {
> return;
> }
>
> function setText($text)
> {
> $this->text = $text;
> }
>
> function getText()
> {
> return $this->text;
> }
> }
>
> Class UsefulStuff
> {
> function singleton($class)
> {
> if (!$GLOBALS['__useful_stuff'][$class]) {
> // Add including the class if not done elsewhere
> $GLOBALS['__useful_stuff'][$class] = new $class();
> }
> return $GLOBALS['__useful_stuff'][$class];
> }
> }
>
> Class Client
> {
> var $display = null;
>
> function Client()
> {
> $this->display =& UsefulStuff::singleton('Display');
> }
> function changeName($n)
> {
> $this->display->setText($n);
> }
> }
>
> ####################
> $d =& UsefulStuff::singleton('Display');
> $c =& new Client;
> print $d->getText() . "\n"; // Should print Default
> $c->changeName('Peter');
> print $d->getText() . "\n"; // Should print Peter
>
> var_dump($d);
> var_dump($c);
>
> ?>
>
> --
> Maple Design - quality web design and programming
> http://www.mapledesign.co.uk
>
>
>
>
> PHP Data object relational mapping generator -
> http://www.meta-language.net/
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