[PHP] problems accesing an object via globals

[julian]

I want to open a database connection at program initialization and use 
that very same connection via globals initilizating ( loading from db) 
other objects.

Basically

index.php

$db=new mysqli(host,us,pass,db);

if(mysqli_connect_errno()){
        die('errordb conex');
}

switch ($var){

        display1:
                $obj=new obj_x();
                $obj->load();
                $obj->display();
                break;
        display2:
                $obj=new obj_y();
                $obj->load();
                $obj->display();
                break;
                
}
------------------

class obj_x{
        function load(){
                globals $db;

                $sql="select ....);
                $ret=$->query($sql); // XX
                ...
                }
}

fails at XX with Warning: mysqli::query() [function.mysqli-query]: 
Couldn't fetch mysqli in class file .... line XX

Any hints ??. I am using php 5.1.6 with linux/ubuntu.

Thanks.

JCG

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