Why is it not connecting to the database?

Question

PHP

Hello.
I am using php 7.1. I'm trying to connect to the database through localhost, but the connection does not occur.
Through 127.0.0.1 everything is connected perfectly.
What this problem can be connected with, with php versions below 7.0 everything works fine.

Answer 1

How do you connect? Native mysql_connect? If yes, then php.net/manual/en/function.mysql-connect.php

Answer 2

Wangyu, you are trying to connect via localhost, it resolves to [::1] and MySQL only listens on an IPv4 socket.

Answer 3

If you are not on Windows, when you connect to mysql on 127.0.0.1, the connection goes over the network, and when on localhost - through unix-socket. php looks for the required socket in the php.ini settings, and mysql looks for it in my.cnf. You probably have different socket settings in your configs.