Attention

TYPO3 v7 has reached its end-of-life November 30th, 2018 and is not maintained by the community anymore. Looking for a stable version? Use the version switch on the top left.

There is no further ELTS support. It is recommended that you upgrade your project and use a supported version of TYPO3.

PHP

Install Tool

In the Install Tool the section "System environment" informs about missing PHP modules and problematic settings.

E.g. the PHP extensions openssl and fileinfo must be enabled. This can be done by adding (or uncommenting) the following lines in the [PHP] section in php.ini:

extension=fileinfo.so
extension=openssl.so

On a Windows-based server, these are the extension files:

extension=php_fileinfo.dll
extension=php_openssl.dll

PHP Caches, Extension Classes etc.

There are some situations which can cause what appear to be totally illogical problems after an upgrade:

• If extensions override classes in which functions have changed. Solution: Try disabling all extensions and then enable them one by one until the error recurs.

• If a PHP cache somehow fails to re-cache scripts: in particular, if a change happened to a parent class overridden by a child class which was not updated. Solution: Remove ALL cached PHP files (for PHP-Accelerator, remove /tmp/phpa_*) and restart Apache.