Host Server settings

What are the recomendations for server setting for opigno? Can I use php 5.3. or I need a higher version. Are there any differences except this: "a. For the installation, and for an optimal performance, Opigno requires at least 256Mo memory for PHP (ideally 512Mo). This can be defined on a Debian server by editing the file /etc/php5/apache2/php.ini and by changing the value of the line memory_limit, for example to have it like this: memory_limit = 512M We also recommend having this value in php.ini in order to avoid problems during the installation: xdebug.max_nesting_level = 200 Then, don't forget to restart the Apache service (service apache2 restart on Debian servers) to have the modifications taken into account. " https://www.opigno.org/160707_Opigno_User-Manual.pdf