Bug #74941 [Com]: Session fails to start after having headers sent

Edit report at https://bugs.php.net/bug.php?id=74941&edit=1 ID: 74941 Comment by: wapinet at mail dot ru Reported by: smorozov at sugarcrm dot com Summary: Session fails to start after having headers sent Status: Closed Type: Bug Package: Session related Operating System: Linux PHP Version: 7.2.0alpha3 Block user comment: N Private report: N New Comment: need to backport to the branch 7.1 Previous Comments: ------------------------------------------------------------------------ [2017-07-20 06:54:48] krakjoe@php.net Automatic comment on behalf of morozov@tut.by Revision: http://git.php.net/?p=php-src.git;a=commit;h=9b9184a45a015a69d39fe88eebd93e14b575afc4 Log: Fixed bug #74941 - Session fails to start after having headers sent ------------------------------------------------------------------------ [2017-07-20 06:53:00] krakjoe@php.net Automatic comment on behalf of morozov@tut.by Revision: http://git.php.net/?p=php-src.git;a=commit;h=9b9184a45a015a69d39fe88eebd93e14b575afc4 Log: Fixed bug #74941 - Session fails to start after having headers sent ------------------------------------------------------------------------ [2017-07-17 14:24:48] smorozov at sugarcrm dot com Description: ------------ If a session start is not supposed to output any headers, it should not fail in the case if response headers have been already sent. The script below works on PHP 7.1 and older versions but doesn't work on PHP 7.2. The same happens when calling session_id($id) before session_start(). Seems similar to #55267. Test script: --------------- <?php ini_set('session.use_cookies', false); ini_set('session.cache_limiter', false); echo '.'; session_start(); Expected result: ---------------- No warning triggered. Actual result: -------------- Warning: session_start(): Cannot start session when headers already sent in test.php on line 8 Call Stack: 0.0001 397720 1. {main}() test.php:0 0.0001 398128 2. session_start() test.php:8 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=74941&edit=1