How to register namespaces/prefixes, directories or classes in Phalcon?

In Phalcon you can register namespaces, prefixes, directories or classes by loader class. Below are sample usage for same.

Registering namespaces/prefixes in Phalcon

use Phalcon\Loader;
$loader = new Loader();

// Register some namespaces
$loader->registerNamespaces(
    [
       "Example\Base"    => "vendor/example/base/",
       "Example\Adapter" => "vendor/example/adapter/",
       "Example"         => "vendor/example/",
    ]
);

// Register autoloader
$loader->register();

Registering directories in Phalcon

use Phalcon\Loader;

// Creates the autoloader
$loader = new Loader();

// Register some directories
$loader->registerDirs(
    [
        "library/MyComponent/",
        "library/OtherComponent/Other/",
        "vendor/example/adapters/",
        "vendor/example/",
    ]
);

// Register autoloader
$loader->register();

Registering classes in Phalcon

use Phalcon\Loader;

// Creates the autoloader
$loader = new Loader();

// Register some classes
$loader->registerClasses(
    [
        "Some"         => "library/OtherComponent/Other/Some.php",
        "Example\Base" => "vendor/example/adapters/Example/BaseClass.php",
    ]
);

// Register autoloader
$loader->register();