Object properties inside other functions

[Christoph09]

I have an Database class with the function dbSelect(args).

I instantiate an object - $DB = new sqlDBO;

I try to use the object's function $DB->dbSelect(args) inside a plain old function from another include (not part of the sqlDBO class), and I get the following error message-

Call to a member function on a non-object

So here's the question: Is it not possible to access objects and their functions from inside other functions?

[laserlight]

You need to make the object global in the function, just like you would any other non-local, non-superglobal variable.

[Christoph09]

How do I make the object global in the function?

I tried -

global $DB;
$DB = new sqlDBO();

But I still get the same error when trying to access the object inside the separate function.

This is a very stripped down, basic version of what I'm trying to do -

require "_dbFunctions.php";

$ado = new sqlDBO();

if ($result = $ado->dbSelect("cmsusers", "1 ORDER BY ID", "*"))
 {
  print "true";
 }

function blowUP ()
 {
  if ($result = $ado->dbSelect("cmsusers", "1 ORDER BY ID", "*"))
	 {
	  print "true2";
	 }  

 }

blowUP();

The call to the dbfunction in blowUP always fails with that error message.