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Bug #72599 Different behavior from 7.0 and below with multiple session_start()s and output
Submitted: 2016-07-14 20:51 UTC Modified: 2016-08-27 06:50 UTC
From: peehaa@php.net Assigned:
Status: Wont fix Package: Session related
PHP Version: 7.1.0alpha3 OS:
Private report: No CVE-ID: None
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From: peehaa@php.net
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 [2016-07-14 20:51 UTC] 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

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 [2016-08-27 06:50 UTC] yohgaki@php.net
-Status: Open +Status: Wont fix
 [2016-08-27 06:50 UTC] yohgaki@php.net 
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.
 
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