Created by: warmwaterkruik
When using a Hydra schema, where you can have @id and id property in the model, the generated PHP code included duplicate id properties, getter and setter methods. The result was thus an invalid class. The Hydra schema is extensively used in the PHP Api Platform codebase.
This change replaces the @ with at characters, just like it does in the Java generator and Rust generator.
@jebentier @dkarlovi @mandrean @jfastnacht @ybelenko @renepardon