> // echo $test."<br>";
> "//" . Without the remark, the code work but I get the error message
> stating ....
>
> Warning: Cannot add header information - headers already sent by
(output
> started at test.php) in test.php on line **
Yes.
A header is called a header because it comes out ahead of the actual page
content.
So what your browser *REALLY* sees is stuff like this:
------------------------
Content-type: text/html
Content-length: 1035
Expiration: Jan 14 2001 20:46:37 GMT
Cookie: user_id "a7fjeju48dj934jdjcu8"
<HTML>
<BODY>test</BODY>
</HTML>
------------------------
Note the blank line between the headers and the HTML tag. That innocent
blank line is very, very significant.
It signifies the *END* of the headers and the beginning of the content.
So, here's the deal. When you print something out, or have an HTML tag, or
have a blank line, PHP has to send that out as part of the Content. Now, in
order to do that, PHP has to send out your headers first, then the blank
line, then whatever your content is.
If you later try to send out a header, using the http://php.net/header
function, or http://php.net/setcookie or http://php.net/session-start
(sessions use cookies to track users), IT IS TOO LATE. That boat already
sailed. Once the headers go out, and the blank line after them, you can't
get more headers to be in front of that blank line that signified the end of
the headers.
> When I put in the remark, the 2nd file, test.php couldn't use
> $GLOBAL["HTTP_REFERER"] because it couldn't find the last file. I was
> thinking that maybe the HTTP_REFERER couldn't reach the last file because
of
> the way the header work.
What exactly are you trying to do with the referer in the 2nd file? Print
it? What? Why?
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