php - String to multidimensional array path

Question

I have a multidimensional array, here is a small excerpt:

Array (
    [Albums] => Array (
        [A Great Big World - Is There Anybody Out There] => Array(...),
        [ATB - Contact] => Array(...),
    )
    [Pop] => Array (...)
)

And I have a dynamic path:

/albums/a_great_big_world_-_is_there_anybody_out_there

What would be the best way to retrieve the value of (in this example) $arr["albums"]["A Great Big World - Is There Anybody Out There"]?

Please note that it should be dynamic, since the nesting can go deeper than the 2 levels in this example.

EDIT

Here is the function I use to create a simple string for the URL:

function formatURL($url) {
    return preg_replace('/__+/', '_', preg_replace('/[^a-z0-9_s-]/', "", strtolower(str_replace(" ", "_", $url))));
}

Answer 1

$array = array(...);
$path  = '/albums/a_great_big_world_-_is_there_anybody_out_there';

$value = $array;
foreach (explode('/', trim($path, '/')) as $key) {
    if (isset($value[$key]) && is_array($value[$key])) {
        $value = $value[$key];
    } else {
        throw new Exception("Path $path is invalid");
    }
}

echo $value;