Migrating from 2.x to 3.x

Instantiating the Isbn class ($isbn = new ISBN()) was deprecated in release 2.6.0 and removed in 3.0.0.

See README to learn how to parse, validate and convert ISBN using the new static public API.

See Methods deprecated in 2.3.0 for guidance on how to migrate from non-static methods isValid, getErrors, validate and format.