flow-php/arrow-ext is a Rust-powered PHP extension that enables reading and writing Apache Parquet files. Built with ext-php-rs and official Apache Arrow/Parquet Rust crates, it provides streaming read/write interfaces supporting all flat Arrow types, nested types (LIST, STRUCT, MAP), and multiple compression algorithms including SNAPPY, GZIP, BROTLI, ZSTD, and LZ4_RAW. It is a subtree split from the flow-php monorepo.