https://phpstudy.connpass.com/event/286669/

# Spec

https://pubs.opengroup.org/onlinepubs/9699919799

> ### 3.403 Text File
>
> A file that contains characters organized into zero or more lines. (略)

---

> ### 3.206 Line
>
> A sequence of zero or more non- \<newline\> characters plus a terminating \<newline\> character.