url_encode() in php?

[bug14]

I'm trying to send three variables from a php using url_encode
the first page is a form that sends variables to the second page with GET, now I want to send those to a third page

header("Location: ohnoes.html?m=".url_encode($_GET['mark'])."&i=".url_encode($_GET['item'])."&p=".url_encode($_GET['price']));

but I get a blank white page that says

Fatal error: Call to undefined function: url_encode() in /myurl/my_php.php on line 14

so like what? do I have to define the function first. I'm new to php and this seems to be a little too much for me

Nevermind! I needed to use urlencode(), NOT url_encode()! I got it now...

and sorry for the double post, but GG is having problems right now and I can't edit