regex phone number validation with PHP

Question

This is another question about a previous question I had asked yesterday. I want user to be allowed to type US phone numbers in the following formats.

(800)-555-121

Answer 1

Re: Rohan Kumar's solution

It does address the issue of fake phone numbers such as 800-123-2222. Real phone numbers have a first digit of at least "2". While the other solutions do the format correctly, they don't address the issue of people putting in phone numbers like 800-000-1234, which would be correct in the other solutions provided.