From:             razvan dot pop at micronets dot ro
Operating system: Irrelevant
PHP version:      Irrelevant
PHP Bug Type:     Documentation problem
Bug description:  Documentation is not clear on header() behaviour

Description:
------------
The documentation page for the header() function
(http://www.php.net/manual/en/function.header.php) doesn't officialy state
that setting headers in this manner:

header('Cache-Control:');
header('Pragma:');

will prevent those headers from being sent even if previously set. Ie. it
will efectively delete the headers.



Reproduce code:
---------------
<?php

session_cache_limiter('nocache');
session_start();
header('Cache-Control: max-age=10000');
header('Pragma:'); // deletes "Pragma: no-cache" set by
                   // session_cache_limiter
header('Expires:');

?>


-- 
Edit bug report at http://bugs.php.net/?id=40390&edit=1
-- 
Try a CVS snapshot (PHP 4.4): 
http://bugs.php.net/fix.php?id=40390&r=trysnapshot44
Try a CVS snapshot (PHP 5.2): 
http://bugs.php.net/fix.php?id=40390&r=trysnapshot52
Try a CVS snapshot (PHP 6.0): 
http://bugs.php.net/fix.php?id=40390&r=trysnapshot60
Fixed in CVS:                 http://bugs.php.net/fix.php?id=40390&r=fixedcvs
Fixed in release:             
http://bugs.php.net/fix.php?id=40390&r=alreadyfixed
Need backtrace:               http://bugs.php.net/fix.php?id=40390&r=needtrace
Need Reproduce Script:        http://bugs.php.net/fix.php?id=40390&r=needscript
Try newer version:            http://bugs.php.net/fix.php?id=40390&r=oldversion
Not developer issue:          http://bugs.php.net/fix.php?id=40390&r=support
Expected behavior:            http://bugs.php.net/fix.php?id=40390&r=notwrong
Not enough info:              
http://bugs.php.net/fix.php?id=40390&r=notenoughinfo
Submitted twice:              
http://bugs.php.net/fix.php?id=40390&r=submittedtwice
register_globals:             http://bugs.php.net/fix.php?id=40390&r=globals
PHP 3 support discontinued:   http://bugs.php.net/fix.php?id=40390&r=php3
Daylight Savings:             http://bugs.php.net/fix.php?id=40390&r=dst
IIS Stability:                http://bugs.php.net/fix.php?id=40390&r=isapi
Install GNU Sed:              http://bugs.php.net/fix.php?id=40390&r=gnused
Floating point limitations:   http://bugs.php.net/fix.php?id=40390&r=float
No Zend Extensions:           http://bugs.php.net/fix.php?id=40390&r=nozend
MySQL Configuration Error:    http://bugs.php.net/fix.php?id=40390&r=mysqlcfg

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