singleton problem

[Peter Bowyer <peter@mapledesign.co.uk>]

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);

?>

-- 
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http://www.mapledesign.co.uk  



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