Is it possible to use a sub-one second delay on header("refresh:...") using PHP?

Question

I know you can refresh the page immediately in PHP using header("refresh: 0;");

You can also set your own delay, which is 3 seconds, as shown below

header("refresh: 3;");

My question is, is it possible to set the delay to less than one second, a tenth of a second?

header("Refresh: 0.1;");

Answer 1

header("refresh: 0.9;"); will be refreshed immediately, header("refresh: 1.9;"); will be refreshed after 1 second, and so on. Decimal points are ignored.

Answer 2

Tried it, it works

For example: header("Refresh: 0.25;"); header("Refresh: 0.1;"); header("Refresh: 0.75;") " ); header("refresh: 0.5;"); Everything seems to work.