Bug #72599 [Opn->Wfx]: Different behavior from 7.0 and below with multiple session_start()s and output

Edit report at https://bugs.php.net/bug.php?id=72599&edit=1 ID: 72599 Updated by: yohgaki@php.net Reported by: peehaa@php.net Summary: Different behavior from 7.0 and below with multiple session_start()s and output -Status: Open +Status: Wont fix Type: Bug Package: Session related PHP Version: 7.1.0alpha3 Block user comment: N Private report: N New Comment: Behavior would not be fixed because starting session when it is impossible to start correctly is a bug of session manager. i.e. There is no point running script with unusable $_SESSION array. Previous Comments: ------------------------------------------------------------------------ [2016-07-14 20:51:57] peehaa@php.net Description: ------------ It seems like the behavior of starting a session has changed between < 7.1 and 7.1. I'm not sure whether this is intentional (I couldn't find any mention of it in NEWS or UPGRADING or I just overlooked it). When trying to start a session twice while the headers have already been sent I get: Notice: A session had already been started - ignoring session_start() in /in/itgeJ on line 5 on the second session_start() call on 7.0 (and below), but on 7.1 I get: Warning: session_start(): Cannot send session cookie - headers already sent by Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /in/itgeJ:2) in /in/itgeJ on line 5 on the second session_start() call. Test script: https://3v4l.org/NXiYR Test script: --------------- output <?php session_start(); session_start(); Expected result: ---------------- Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /in/NXiYR:2) in /in/NXiYR on line 4 Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /in/NXiYR:2) in /in/NXiYR on line 4 Notice: A session had already been started - ignoring session_start() in /in/NXiYR on line 5 Actual result: -------------- output Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /in/NXiYR:2) in /in/NXiYR on line 4 Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /in/NXiYR:2) in /in/NXiYR on line 4 Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /in/NXiYR:2) in /in/NXiYR on line 5 Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /in/NXiYR:2) in /in/NXiYR on line 5 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=72599&edit=1