如何将变量用作多维关联数组键？

Question

I have an array that has a sub array I can access via

$fund['ManagersSets'][0]['PortfolioDate'];

I want to use a string variable for the array key. Something like:

$key = "'ManagersSets'][0]['ManagerBreakdowns'";
print_r($fund[$key]);

But get an undefined index notice when I run it. Is there a way to do this?

Answer 1

Does it have to be a string? You could do something like this:

$key = array('ManagerSets', 0, 'ManagerBreakdowns');
$result = $fund;
foreach($key as $index)
  $result = $result[$index];
print_r($result);

This does seem rather wacky and not really safe, but if you have to do it like that, you can.

If you really need strings, you can easily convert one to an array like that using explode or preg_split.

Again I do not recommend that you use this. It would probably be better to order your data differently.