scope of database conmection

Dear friends

I'm starting with PHP, and I have any questions:

How interchange the values of global variables between different files of php's scripts?

By example
in file bdgeo.php3
$bd contains the link to an open data base
this file call to other file named b1.php3
in file b1.php3
$db is unknow!

I think that the connection to the database should make only one time, in first script. In other way, How I maintain active the database connection among the different pages?

Can somebody help me?

Thank you
Luis A. Gonzalez
BCN

Nope, you have to re-establish the database connection on the next page. In the background, PHP may be using a persistent connection, but that depends on configuration.

Easiest way to do this is make an include file that has the database connection command(s) and then 'require("<file>.inc"); at the top of each script that needs a database.

Then if anything ever changes (location of DB, name, etc), you only have to change the parameters once...