php create multidimensional array from flat one

Question

I have an array like this:

 \'foo\', 1 => \'bar\', ..., x => \'foobar\' );
?>

What is the fas

Answer 1

You can use a recursive function so that you're not iterating through the array each step. Here's such a function I wrote.

function expand_arr($arr)
{
    if (empty($arr))
        return array();

    return array(
        array_shift($arr) => expand_arr($arr)
    );
}

Your question is a little unclear since in your initial statement you're using the next value in the array as the next step down's key and then at the end of your example you're using the original key as the only key in the next step's key.