字符串多維數組路徑

Question

我有一個多維數組，這裏是一個小摘錄：

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

而且我有一個動態的路徑：

/albums/a_great_big_world_-_is_there_anybody_out_there 

什麼是檢索的最佳方式（在這個例子中）$arr["albums"]["A Great Big World - Is There Anybody Out There"]？

請注意它應該是動態的，因爲在這個例子中嵌套可以比2層更深。

編輯

下面是我用它來創建用於URL簡單的字符串函數：

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;