Bug #71521 [Opn]: session_start floods header with Set-Cookie when called multiple times

Edit report at https://bugs.php.net/bug.php?id=71521&edit=1 ID: 71521 Updated by: laruence@php.net Reported by: David dot Gausmann at measX dot com Summary: session_start floods header with Set-Cookie when called multiple times Status: Open Type: Bug Package: Session related Operating System: Windows PHP Version: 7.0.3 Block user comment: N Private report: N New Comment: I can not reproduce this... only one cookie header is sent in my box. (php-cgi) Previous Comments: ------------------------------------------------------------------------ [2016-02-04 16:07:29] David dot Gausmann at measX dot com Description: ------------ In a productive website of a customer I need to start/stop the session multiple times during the execution of a single PHP script. In some cases the proxy server had thrown HTTP error 502 that the header is too long. I've found out, that session_start always adds a Set-Cookie header, regardless of the fact that there is already exactly the same header line. This bug has already been reported here, but is still unfixed, so I create a new bug report: https://bugs.php.net/bug.php?id=38104 https://bugs.php.net/bug.php?id=31455 Test script: --------------- <?php session_name('Test'); session_cache_expire(180); session_set_cookie_params(0, '/', '', false, true); for($i = 0; $i < 10000; ++$i) { session_start(); session_write_close(); } ?> Expected result: ---------------- Set-Cookie: Test=68nh86r3ks6jo6tughb7d3u7a5; path=/; HttpOnly (exactly one time) Actual result: -------------- Set-Cookie: Test=68nh86r3ks6jo6tughb7d3u7a5; path=/; HttpOnly Set-Cookie: Test=68nh86r3ks6jo6tughb7d3u7a5; path=/; HttpOnly Set-Cookie: Test=68nh86r3ks6jo6tughb7d3u7a5; path=/; HttpOnly Set-Cookie: Test=68nh86r3ks6jo6tughb7d3u7a5; path=/; HttpOnly Set-Cookie: Test=68nh86r3ks6jo6tughb7d3u7a5; path=/; HttpOnly Set-Cookie: Test=68nh86r3ks6jo6tughb7d3u7a5; path=/; HttpOnly ... (10000 times) ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=71521&edit=1