PHP字符串到多级数组

Question

How to convert this* string:

$arrKeys = ['lev1', 'lev2', 'lev3'];
$val = 'foo';

In to the following array:

Array
(
[lev1] => Array
    (
        [lev2] => Array
            (
                [lev3] => foo
            )

    )
)

*Number of array keys may vary. Each array key except the last one represents Array.

Thank you!

Answer 1

No recursion necessary:

$arrKeys = array_reverse(['lev1', 'lev2', 'lev3']);
$val = 'foo';

$result = $val;

foreach ($arrKeys as $key) {
    $result = [$key => $result];
}

print_r($result); 

// Array
// (
//     [lev1] => Array
//     (
//         [lev2] => Array
//         (
//             [lev3] => foo
//         )
// 
//     )
// 
// )

Just build the array from the inside out.