Web server such as Apache or IIS
Local or command line access is needed for running maintenance scripts
PHP version 5.3.3 or later
Due to a security issue with PHP it is strongly advised to use PHP 5.3.5+ (see here for more details).
with Perl Compatible Regular Expressions
with Standard PHP Library
with JSON support
Database Server
MySQL 5.0.2 or later (*)
or PostgreSQL 9.0 or later
or SQLite