TYPO3 Core

Trying to open the Backend of TYPO3 6.2 with the current PHP 5.6.3 gives this deprecation notice:

Deprecated: Automatically populating $HTTP_RAW_POST_DATA is deprecated and
will be removed in a future version. To avoid this warning set 'always_populate_raw_post_data' to '-1' in php.ini
and use the php://input stream instead. in Unknown on line 0

Warning: Cannot modify header information - headers already sent in Unknown on line 0

Backtrace:

Uncaught TYPO3 Exception
#1: PHP Warning: Cannot modify header information - headers already sent in 
...\typo3\sysext\core\Classes\Authentication\AbstractUserAuthentication.php line 478 (More information)

TYPO3\CMS\Core\Error\Exception thrown in file
...\typo3\sysext\core\Classes\Error\ErrorHandler.php in line 101.

5 TYPO3\CMS\Core\Error\ErrorHandler::handleError(2, "Cannot modify header information - 
headers already sent", "...\typo3\sysext\core\Classes\Authentication\AbstractUserAuthentication.php", 478, array)

4 header("Expires: 0")

...\typo3\sysext\core\Classes\Authentication\AbstractUserAuthentication.php:

00476:   // Set all possible headers that could ensure that the script is not cached on the client-side
00477:   if ($this->sendNoCacheHeaders && !(TYPO3_REQUESTTYPE & TYPO3_REQUESTTYPE_CLI)) {

00478:    header('Expires: 0');

00479:    header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
00480:    $cacheControlHeader = 'no-cache, must-revalidate';

3 TYPO3\CMS\Core\Authentication\AbstractUserAuthentication::start()

...\typo3\sysext\core\Classes\Core\Bootstrap.php:

00981:   // might trigger code which relies on it. See: #45625
00982:   $GLOBALS['BE_USER'] = $backendUser;

00983:   $backendUser->start();

00984:   return $this;
00985:  }

2 TYPO3\CMS\Core\Core\Bootstrap::initializeBackendUser()

...\typo3\init.php:

00056:  ->loadExtensionTables(TRUE)
00057:  ->initializeSpriteManager()

00058:  ->initializeBackendUser()

00059:  ->initializeBackendAuthentication()
00060:  ->initializeBackendUserMounts()

1 require("...\typo3\init.php")

...\typo3\ajax.php:

00042: }
00043: 

00044: require __DIR__ . '/init.php';

00045: 
00046: // Finding the script path from the registry