Header Problem though header is not sent before [duplicate]
I know before sending their should not be any printing statement on the screen. and I haven't did that in my code. Their is no echo statement no print s开发者_运维知识库tatement.
warning Cannot modify header information - headers already sent by (output started at /home/oxfordmo/public_html/php/user/header.php:18) in /home/oxfordmo/public_html/php/user/index.php on line 21
Its showing error in header file.
Indexfile line 21
header("location:user.php?f=".base64_encode($_SESSION['firstname'])."&l=".base64_encode($_SESSION['lastname']));
and header file 15-20
<div id="wrapperheader">
<div id="menu">
<ul>
<li class="active"><a href="">Company</a></li>
<li><a href="">Services</a></li>
<li><a href="">Gallery</a></li>
Make sure you have no output before the header - this includes, but is not limited to, HTML output outside of the PHP block, output from includes you might do. Also check for unseen whitespace in includes after their closing ?> (many just leave them out for this exact reason).
It seems like you're including that header.php file before sending the headers, that is, you have something like this:
include( header.php );
...
header( 'Location: ...' );
If this is the case, you have to move the header command to before including the file. Anything that outputs page content is not allowed before sending a header. That includes outputting "raw" HTML outside PHP tags (... ?> <html> <?php ...)
Yes there is HTML output in line 18. You can not use the header function after HTML output has been created. That simple it is.
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