santeven on "WP development locally - Error establishing a database connection"

You are welcome,

Are you missing the DB_NAME definition from your wp-config.php ?

From wp-config-sample.php :

// ** MySQL settings - You can get this info from your web host ** //
/** The name of the database for WordPress */
define('DB_NAME', 'database_name_here');

/** MySQL database username */
define('DB_USER', 'username_here');

/** MySQL database password */
define('DB_PASSWORD', 'password_here');

/** MySQL hostname */
define('DB_HOST', 'localhost');