Fix mysqli_real_connect(): (HY000/2002): No such file or directory

1. When trying to access http://localhost/phpmyadmin, following messafe is displayed:
mysqli_real_connect(): (HY000/2002): No such file or directory

2. In order to fix, edit config.inc.php
vi config.inc.php

3. Replace
$cfg['Servers'][$i]['host'] = 'localhost';
with
$cfg['Servers'][$i]['host'] = '127.0.0.1';

After this change, it works!