define('DB_NAME', 'wordpress');
define('DB_USER', 'wordpress');
define('DB_PASSWORD', 'wordpress');
define('DB_HOST', 'localhost');
$table_prefix  = 'wp_';

$ mysql -h localhost -u wordpress --password=wordpress
> wordpress -e 'select user_login from wp_users'
+------------+
| user_login |
+------------+
| simon      |
+------------+

$ php --ri mysql

mysql

MySQL Support => enabled
Active Persistent Links => 0
Active Links => 0
Client API version => mysqlnd 5.0.7-dev - 091210 - $Revision: 294543 $

Directive => Local Value => Master Value
mysql.allow_persistent => On => On
mysql.max_persistent => Unlimited => Unlimited
mysql.max_links => Unlimited => Unlimited
mysql.default_host => no value => no value
mysql.default_user => no value => no value
mysql.default_password => no value => no value
mysql.default_port => no value => no value
mysql.default_socket => /var/mysql/mysql.sock => /var/mysql/mysql.sock
mysql.connect_timeout => 60 => 60
mysql.trace_mode => Off => Off
mysql.allow_local_infile => On => On