Bug #73245 [NEW]: session_start() doesn't start the session if headers have been sent

From: php at duncanc dot co dot uk Operating system: Linux PHP version: 7.1.0RC3 Package: Session related Bug Type: Bug Bug description:session_start() doesn't start the session if headers have been sent Description: ------------ In 7.0 and 5.6 calling session_start() even if headers have been sent still made $_SESSION usable, but 7.1 changes this behaviour. Test script: --------------- session_start(); $_SESSION['blah'] = 'foo'; var_dump($_SESSION); session_write_close(); session_start(); var_dump($_SESSION); Expected result: ---------------- The dumped array should be the same both times: array(1) { ["blah"]=> string(3) "foo" } Actual result: -------------- The second array dump is empty -- Edit bug report at https://bugs.php.net/bug.php?id=73245&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=73245&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=73245&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=73245&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=73245&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=73245&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=73245&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=73245&r=needscript Try newer version: https://bugs.php.net/fix.php?id=73245&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=73245&r=support Expected behavior: https://bugs.php.net/fix.php?id=73245&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=73245&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=73245&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=73245&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=73245&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=73245&r=dst IIS Stability: https://bugs.php.net/fix.php?id=73245&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=73245&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=73245&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=73245&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=73245&r=mysqlcfg