PHP

mysqli_real_connect(): (hy000/2002): no such file or directory

Locate config.sample.inc.php

Change

$cfg['Servers'][$i]['host'] = 'localhost';
into

$cfg['Servers'][$i]['host'] = '127.0.0.1';
Save.

Then rename the file and remove sample from the name.

mysqli::real_connect(): (HY000/2002): No such file or directory

Locate config.sample.inc.php

Change

$cfg['Servers'][$i]['host'] = 'localhost';
into

$cfg['Servers'][$i]['host'] = '127.0.0.1';
Save.

this happen becuse you may using multipe mysql server on system and
php did not recognized the localhost 

and mysql default port is always 3306 

try to connect via terminal first

Run =>>
mysql -h 127.0.0.1 -P 3306 -uroot -p

then password 

you are in if password is correct