Using global within a class

I have a class from within which other classes are called.

In the constructor, I want to create an instance of a database connection,
so that this database can be called elsewhere.

<?php
# Declare a class foo
class foo
{
# Constructor
function foo
{
# Load the class file
require_once ('database.class.php');

# Create a database object
$database = new database ();
}


# Function to do work
function doWork ()
{
# Get the database object
global $database;

# Call some method from within bar
echo $database->doSomethingElse ();
}
}
?>

If I now create an instance of that object:

<?php
# Create a foo
$foo = new foo ();

# Get foo to do stuff
$foo->doWork ();
?>


... this doesn't work. Instead, I get:

Fatal error: Call to a member function doSomethingElse() on a
non-object in {filename} on line {line number}


Basically the global isn't picking things up from the rest of the class.

Normally I would use the standard $this-> system, but the problem is that
accessing the database could be several levels deep.

Any idea how I can make use of a global variable without having to
continually pass the object between functions, i.e.

function doWork ($database)
echo $database->doSomethingElse ();
}

constantly?


Martin

Am Tue, 10 Aug 2004 18:11:35 +0100 schrieb Martin Lucas-Smith:

>
> Normally I would use the standard $this-> system, but the problem is that
> accessing the database could be several levels deep.
>

what kind of problem would that be?

Martin Lucas-Smith wrote:
>
>
> I have a class from within which other classes are called.
>
> In the constructor, I want to create an instance of a database
> connection, so that this database can be called elsewhere.
>

Variables in functions are destroyed when the function is finished. You
have to define your variable outside the class and do global $database;
everywhere you need it. It also might be interesting to (re)read the
part about scopes in the PHP Manual.

--
Pieter Nobels