Why does gmail remove the sender's name from an email sent via php, leaving only the email?

Question

gmail

We send a letter from php
We receive it on mailtrap.io, there is a sender name
We receive exactly the same on gmail or Yandex, there is no sender name
How so?
I look at the original letter in gmail, the sender's name is stupidly not in the From: header.
I look at the original letter in nailtrap.io, the sender's name is there)

Answer 1

Is the name correctly entered into the title, recoded into ASCII-7?

Answer 2

Most likely, From is formed incorrectly and does not comply with standards, so GMail normalizes it.