Web:Extend currently requires PHP 5.2. It may function with an older version of PHP, but we can provide no guarantee of this. Additionally, it requires the SPL extension to be enabled (which is the default configuration).

Other requirements depend on the modules you intend to use. We recommend you enable the intl, SimpleXML and XSL extensions to begin with, along with the extension for the database you intend to use. Most common database types are supported.