#40390 [NEW]: Documentation is not clear on header() behaviour

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