If you need to increase memory limit for your wordpress install in 1&1
source : http://www.mistipi.com/wordpress-php-11-augmenter-la-memoire-allouee/
- Adjust $path in phpini.php
- Upload both files to your root folder
- go to yoursite.com/phpini.php, this will copy php.ini in every folder of your site
- remove phpini.php