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Need advice on the approach of developing a web application

We have a DB class (Zebra database). We need access to the DB from almost every page in the php application.
Is there any performance / security issue with global DB variable?
If yes, What is the best way to reduce the load / security concerns, if any?
Also, we have OO just for the DB. Rest all will be procedural.

We currently use the following:

functions.php -> Has all functions where we define the DB instance as global.
    // make $db available inside the function
    global $db;
    return $db->dlookup('pricing', 'product', 'pid = ?', array($productid));

init.php -> This file instantiates the DB connection
$db = new Database();

page.php -> This file 'requires' the functions.php and init.php and does the processing specific to the requirements. There will be multiple pages which will do the same, require functions.php and init.php
eg.       $rowproductcost = getcost($productid);
1 Solution
Matthew KellyCommented:
There shouldn't be any issue with global db variable, security or performance wise.

As a reference, Wordpress, one of the most popular blogging software implements db access through a global function: http://codex.wordpress.org/Function_Reference/wpdb_Class

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