[RESOLVED] trying to understand some code

[rnunes]

Hello, I'm just starting off in php, and I downloaded a script just to learn what things do and play around with it a little bit.

I got to a string, and am having some difficulty figuring out how it fully works.

$count = $db->GetOne("SELECT COUNT(*) FROM `{$tables['link']['name']}` WHERE `STATUS` = '2' AND `CATEGORY_ID` = ".$db->qstr($id)." {$expire_where}");

A couple things in there that I don't understand what they do is

->
.$db->qstr($id). // is the variable $db supposed to be assigned somewhere else in the script? is qstr a default php command, or is that a custom function? and what exactly does -> do?

Thanks in advance for your help!!

[Piranha]

$db is a object, -> is calling a function or a variable in the object. So qstr() is a function. To really understand it you should read about classes and objects.

[rnunes]

Piranha wrote:

$db is a object, -> is calling a function or a variable in the object. So qstr() is a function. To really understand it you should read about classes and objects.

Thanks a lot!! Reading through it now.