yii2 - Setting up a database for Yii 2 -

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i need install app written in yii 2 on local computer. installed composer , initiated app with:

php /path/to/yii-application/init

now need "create new database , adjust components['db'] configuration in common/config/main-local.php accordingly."

i have no clue how that.

1) create database on server.
2) open common/config/main-local.php

edit components to: 

'components' => [     'db' => [         'class' => 'yii\db\connection',         'dsn' => 'mysql:host=localhost;dbname=database_name',         'username' => 'database_user',         'password' => 'database_password',         'charset' => 'utf8',     ],

if using mamp mac edit dsn line :

'dsn' => 'mysql:unix_socket=/applications/mamp/tmp/mysql/mysql.sock;dbname=database_name'

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