How do I use this thing: "->"

[Anon]

I've found many time the use of '->': Here is a few examples:
$snoopy = new Snoopy;
$snoopy->fetchtext("http://www.php.net/");
print $snoopy->results;
$snoopy->submit($submit_url,$submit_vars);

$this->mark->SetType(MARK_CIRCLE); $this->mark->SetColor($this->color);

What does mean these '->'?
How should I use them?
Or do you know where could I find and article or tutorial explaining the use of this element?
Thanks for your help

[Anon]

The -> references properties (i.e. variables) or methods (i.e. functions) within an object.

There are a few articles on this site regarding object oriented (OO) programming in PHP, check out the list at http://www.phpbuilder.com/columns/

[Anon]

Thats part of Object Orientated PHP which is a subject that cannot be covered by a meer posting.

Theres loads of tutorials on OO PHP including on phpbulider, so search and learn.

steve