[PHP-DB] Using global variables in mysqli-extended class

[Guus der Kinderen]

Could someone confirm or deny this? I'm running php5.0.0 with mysqli 
extention as a Apache2 module on a Windows XP box. I've tested the 
database by querying it with mysqli (procedural) and results are coming 
back just fine. This makes me believe that the mysqli-extention is 
working properly.

Running this code (see below), you would expect an output like 
"xconstructorytest" however, I'm getting "xy" (the private variable 
$somevar isn't set and/or read). No reported errors or warnings.

Changing the line that says
 class database_foobar extends mysqli
to
 class database_foobar
gets me the expected result of "xconstructorytest". Somehow, making the 
class an extention of mysqli, seems to interfere with calling the 
$somevar variable.

Can anyone confirm this, or explain this behaviour to me?
Regards,
        Guus der Kinderen
// ************ php code ***********
error_reporting(E_ALL);
class database_foobar extends mysqli
{
        private $somevar;
        function database_foobar()
        {
                $this->somevar = "constructor";
                echo "x";
                echo $this->somevar;
        }
        function test()
        {
                $this->somevar = "test";
                echo "y";
                echo $this->somevar;
        }
}
$foo = new database_foobar();
$foo->test();
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