Serde (pronounced "seer-dee") is a fast, flexible, powerful, and easy to use serialization and deserialization library for PHP that supports a number of standard formats. It draws inspiration from both Rust's Serde crate and Symfony Serializer, although it is not directly based on either.

At this time, Serde supports serializing PHP objects to and from PHP arrays, JSON, YAML, and CSV files. It also supports serializing to JSON or CSV via a stream. Further support is planned, but by design can also be extended by anyone.