redirection wont work when preceded by include

[had1980]

it is some admin pages, when logged in it will redirect to another page using header("location : main.php"), I am putting the instruction include("db.php"); before the header instruction so no redirection is made, but when i move the header above the include the direction work, in another case i would put it above and finish , but in this case i am forced to put the header below the include.
I even cleared the file db.php, i was worry the problem was from there but the problem persist.

thanks.

[Weedpacket]

Sounds like db.php generates some output. This may be by accident; if there are any blank lines before the <? or after the ?> then that will mean later calls to header() won't work. This is because the server saw those lines, thought they were part of the response body, and stopped sending headers.

Are you getting an error message? (Might not happen if your error reporting level is turned down too low (or off).)

[had1980]

thank you, now it is working.