Php 404 Not Found Header

Question

I am trying to understand the combination of 3 simple php code lines, This is the code:

ob_end_clean();
header(\'HTTP/1.0 404 Not Found\');
exit;
         


        

Answer 1

why should i use the exit After the 404 header

So that no further code will be executed. If there isn't any then, fine, it isn't necessary in this case. It's a good habit to get into though.

Also why with the BOM i dont get "headers already sent error"

You didn't configure your PHP installation to show errors and notices to the end user.