从php中的一个数组文件中读取保存的文本

我创建了一个生成数组的脚本。这个数组需要存储，这样，如果用户想导出其内容（例如打印），就可以了
这是我的数组（$doc）

Array  
     (  
    [0] => Array  
    (  
        [0] => ------  
        [1] => ---Start----  
        [2] => -------  
        [3] => Generated on Saturday, 3rd, August 2013  
    )
[1] => Array
    (
        [0] => ------
        [1] => -------
        [2] => -------
        [3] => -----------------------
    )
[2] => Array
    (
        [0] => Tid
        [1] => Policy
        [2] => Budget
        [3] => User
        [4] => Capturetime
        [5] => Country
    )
[3] => Array
    (
        [0] => 1
        [1] => ask
        [2] => das
        [3] => carol
        [4] => 2013-07-09
        [5] => Ethiopia
    )
[4] => Array
    (
        [0] => 2
        [1] => das
        [2] => adsasd
        [3] => ck
        [4] => 2007-07-13
        [5] => Slovakia
    )
[5] => Array
    (
        [0] =>  
        [1] =>  
        [2] =>  
        [3] =>  
    )
[6] => Array
    (
        [0] => ------
        [1] => ---End----
        [2] => -------
    )
)

现在我将数组保存到一个文件中：
file_put_contents('array.txt', print_r($printdoc, true));
然后，我想将array.txt的内容回调到数组$printdoc，并将其用作数组。$printdoc = file_get_contents('array.txt', true);我得到$printdoc作为字符串而不是数组
有什么帮助吗？