How to do email validation with PHP?

Question

PHP

During registration, it is necessary to check the mailbox by sending a letter with a code to the email that the user indicated, then this code must be entered on the site and thus confirm the email. If you know a better option, please tell me.

Answer 1

When registering, before sending a letter, create an entry in some kind of authKey, which you write to both the database and the letter.
After entering, check the authKey to see if it is in the database. If there is, then the soap is considered correct. What is the question then?