PHP - 访问同一阵列中的数组元素 [英] PHP - Accessing array element within the same array

问题描述

有一个阵列，我想打电话给一个值给在同一阵列中的一个关键！结果
我在下面的例子中，我曾试着拨打一个特定的值赋予键默认在同一阵列内，但没有成功！是否有可能做到这一点在 PHP ？这里是我的数组：

Having an array, I want to call a value giving a key within the same array!
In my following example, I have tried to call a particular value giving the key 'default' within the same array, but without success! Is it possible to do that in PHP? Here is my array:

$inc_folders = array(
         'default' => "def_folder",
         'file'     => $inc_folders['default'] . "/textfile.txt" 
    );

调用 $ inc_folders值['文件'] ，我希望的结果是以下内容：def_folder / TextFile.txt的 ;但我得到一个错误！结果

calling the value in $inc_folders['file'], I would want the result be the following: "def_folder/textfile.txt"; but I obtain an error!

请，你能不能帮我解决？结果
非常感谢！

Please, can you help me to resolve that?
Many thanks!

推荐答案

您需要将其分配给一个变​​量第一;像这样：

You need to assign it to a variable first; like so:

$folder = "def_folder";
$inc_folders = array(
    'default' => $folder,
    'file'     => $folder . "/textfile.txt" 
);

或者，构建分两步阵列

Or alternatively, build the array in two steps:

$inc_folders = array(
    'default' => "def_folder"
);

$inc_folders['file'] = $inc_folders['default'] . "/textfile.txt";

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