PHP - Delay on redirect

Question

I\'m using the following code to use as a form of nulling referring script and it works perfectly but it just redirects them straight to the target URL.

How would I

Answer 1

What about using sleep()?

function method1(...) {

sleep(5);

... rest of the code

Note however that it is more recommended to use Vahe Shadunts's answer, which uses header() instead.