passing a mysqli object via globals

[julian <correojulian33-php@xxxxxxxx>]

warn: already posted in general.... with no response... maybe is too 
basic.. but I RTFM and  still is not clear to me what I am doing wrong....


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

require_once ('file.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 file.php


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

        $sql="select ....);
        $ret=$db->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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