access to 'If-Modified-Since' header

how can i access to mentioned header, sent from a user?
so i can determine whether send him back 200 OK or 304 not modified..

or is there any other way?

your web-server should handle this for you ? however ..


<?php
print_r(apache_request_headers());
?>


should show you all the client headers (was named getallheaders() prior to PHP 4.3.0)

and how can i remove header:)?

i would like to have 'write' access:)

theres also list_headers() (http://www.php.net/list_headers)
but you won't get write access to modify headers. You still can send a new header.