Food and Entertaining Is Symphony a CMS? Is Symphony a CMS? Symphony CMS is a content management system that is built using PHP language. ... The Symphony CMS is a versatile Open Source tool for managing content. Unlike many familiar LAMP CMS like WordPress, Symfony uses XML for content storage. Related Posts:Is Symfony an MVC?Is WordPress good for web apps?What program will open a XML file?Is Microsoft ASP.NET a CMS?