Bug #55850 [NEW]: header() / setcookie() / session_start() give bogus warning

From: Operating system: Linux PHP version: 5.3.8 Package: CGI/CLI related Bug Type: Bug Bug description:header() / setcookie() / session_start() give bogus warning Description: ------------ SAPIs that do not support HTTP header(s), give warnings that output has been already sent like "Warning: Cannot modify header information - headers already sent by..." even those APIs do *not* support headers. There is no use to warn about something that can never happen; There is nothing to modify; There are no headers that already have been sent. It might make more sense to warn that this function is useless w/o HTTP response headers being available. Compare with headers_sent(), it does differ between SAPIs. Would be nice to have this a bit more streamlined. Additionally header() could return FALSE if it failed like setcookie(). Test script: --------------- In CLI: <?php echo "output"; session_start(); setcookie("TestCookie", 'value'); header('X-TestHeader: value'); ?> -- Edit bug report at https://bugs.php.net/bug.php?id=55850&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=55850&r=trysnapshot54 Try a snapshot (PHP 5.3): https://bugs.php.net/fix.php?id=55850&r=trysnapshot53 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=55850&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=55850&r=fixed Fixed in SVN and need be documented: https://bugs.php.net/fix.php?id=55850&r=needdocs Fixed in release: https://bugs.php.net/fix.php?id=55850&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=55850&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=55850&r=needscript Try newer version: https://bugs.php.net/fix.php?id=55850&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=55850&r=support Expected behavior: https://bugs.php.net/fix.php?id=55850&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=55850&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=55850&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=55850&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=55850&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=55850&r=dst IIS Stability: https://bugs.php.net/fix.php?id=55850&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=55850&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=55850&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=55850&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=55850&r=mysqlcfg