Requirements 4.0

• PHP >= to 5.3. The new namespaces we are using require PHP version greater than/equal to 5.3. Sorry!
• MySQL --anything over 4 should be ok
• Web server -- usually Apache, but some people have SubjectsPlus running on IIS
• JavaScript enabled for the admin to work properly.

If you run into any missing/weird functionality, check that the following extensions are enabled for PHP:

• cURL
• MySQL
• mbstring (not necessary, but you'll need to tweak header.php without this)
• simplexml (for reading RSS feeds)
• json (some data is stored as json)
• gettext (only if you need internationalization, aka translations)
• gd (image resizing--notably for headshots and generation of video thumbnails)

Some Helpful Install Commands

Debian/Ubuntu

sudo apt-get install mysql-server mysql-client apache2 php5 libapache2-mod-php5 php5-mysql php5-curl php5-gettext php5-gd

Red Hat/Fedora/Scientific Linux

sudo yum install mysql mysql-server httpd php php-mysql php-gd php-xml php-mbstring