Classes and access to outside variables

[Merlin <ngroups@xxxxxxxxxxx>]

Hi there,

I am new to PHP classes and I do want to access a variable outside the 
class, but somehow that does not work. global also does not have any effect.

In the following example I would like to be able to access $dbh from 
inside the class like I did in that example. This does not work. Can 
somebody please give me a hint on the right syntax?

$dbh = 'test';

class search_helper extends AjaxACApplication
    {
        /**
         * Database connection details
         */

        var $db_hostname = $dbh;

Thank you for any help,

Merlin

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