Spatie Schema.org

A fluent builder for Schema.org types and a generator of JSON-LD markup, written in PHP. You chain methods to describe a business, article or other entity, then output ld+json for the page. Version 1.6.0 added every Enumeration child type as a class with constants. For bigger pages it supports graphs with multiple items, node identifiers and entities with more than one type, and a section on advanced usage covers the rest. The type and property list is not covered by full API documentation, so developers refer to the source or to schema.org itself. A changelog, testing notes and a security contact are provided. It is MIT licensed and free to use, and the makers ask for a postcard if it reaches production.