Any way to find out headers of a website?

Is there any code to find out headers of a website while indexing or checking a website?

to return 404 headers when pages are not found like that!

 

I am just asking how I can check it!

Suppose if I am indexing a website or a url

I have to see whether domain is on a parked page or not?

For that what I have to do?

 

If you have PHP 5:

$headers = get_headers('http://www.example.com');

PHP:

www.php.net/get_headers

 

PHP4 -

getallheaders();

PHP:

http://www.php.net/getallheaders

 

^^ This does not get the headers from a remote site.