Elgg demo | Elgg 1.8.X demo: Elgg requirements: "Due to Elgg's advanced functionality, there are some extra configuration requirements:
The Apache web server needs to be installed with the following modules:
MySQL 5+ is needed for data storage
PHP 5.2+ needs to be installed as an Apache module (not in CGI mode or safe mode) with the following libraries:
GD and Freetype (for graphics processing, eg user icon rescaling and Captcha)
JSON (for API functionality)
XML (not installed/compiled by default on all systems)
Multibyte String support (for internationalisation)
It is recommended that you increase the memory available to PHP threads beyond the standard 8 or 12M, and increase the maximum uploaded filesize (which defaults to 2M). By default, these settings have been set for you in the .htaccess file in the base Elgg directory."
'via Blog this'