字符串到多维数组路径

Question

我有一个多维数组，这是一个小摘录：

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

我有一个动态路径：

/albums/a_great_big_world_-_is_there_anybody_out_there

检索（在此示例中）$arr["albums"]["A Great Big World - Is There Anybody Out There"]的值是什么？

请注意，它应该是动态的，因为嵌套可以比此示例的两个级别更深。

编辑

这是我用来为URL创建一个简单字符串的功能：

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;