Error establishing a database conection - php

Question

While trying install wordpress i recieve following error
I use wampserver i have changed wp-config.php file and now it looks like this:
define('DB_NAME', 'wordpress');
/** MySQL database username */
define('DB_USER', 'root');
/** MySQL database password */
define('DB_PASSWORD', 'root');
/** MySQL hostname */
define('DB_HOST', 'localhost');//i used 127.0.0.1 too but no matter
define('WP_DEBUG', true);
wp-db.php file:
1379 line:
mysqli_real_connect( $this->dbh, $host, $this->dbuser, $this->dbpassword, null, $port, $socket, $client_flags );
1409 line:
$this->dbh = mysqli_connect( $this->dbhost, $this->dbuser, $this->dbpassword, $new_link, $client_flags );
but still no result I do not know what to do can anyone help me?

Answer 1

if you are using default configuration of xampp/wamp try with
define('DB_PASSWORD', ''); // for localhost
generally localhost db config:-
host = localhost
user = root
password = '' (blank)

Answer 2

Is root really the MySQL user you want to connect as? Is root its password?
It's usually not necessary and from a security standpoint potentially very dangerous to let web applications use your MySQL root user. Create a new user for your WordPress instance, give it its own database:
CREATE DATABASE wordpress;
GRANT ALL PRIVILEGES ON wordpress.* TO blog#localhost IDENTIFIED BY '3AmAbsKCsrKDw':
Then use that user
define('DB_NAME', 'wordpress');
/** MySQL database username */
define('DB_USER', 'blog');
/** MySQL database password */
define('DB_PASSWORD', '3AmAbsKCsrKDw');
/** MySQL hostname */
define('DB_HOST', 'localhost');
define('WP_DEBUG', true);
That should let you connect. Verify that you can connect with those login credentials before continuing to your WordPress setup. WAMP includes a phpMyAdmin interface as far as I know, so try those credentials there.

Answer 3

Update your wp-config.php file like this
define your database name when you create on your localhost or server
define('DB_NAME', 'Your database name');
Ex:- You create your database name like "wordpress" then put database name like
define('DB_NAME', 'wordpress');
If you run your project in local always put root and when you upload database in your server you put your database user name when you create database
define('DB_USER', 'root');
Put your password when you create database on server other wise you can put ''
define('DB_PASSWORD', '');
define('DB_HOST', 'localhost');
define('WP_DEBUG', true);