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early you put:

$config['db']['host']   = "localhost";
$config['db']['user']   = "user";
$config['db']['pass']   = "password";
$config['db']['dbname'] = "exampleapp";

##then...

Exactly as we did for adding Monolog to the DIC, we’ll add an anonymous function that sets up the dependency, in this case called db:

$container['db'] = function ($c) {
    $db = $c['settings']['db'];
    $pdo = new PDO("mysql:host=" . $db['host'] . ";dbname=" . $db['dbname'],
        $db['user'], $db['pass']);
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
    return $pdo;
};