将数组转换为多维数组

Question

I have an array that looks something like this:

array:2 [
    "test1_test2_test3" => "result"
    "category_slug" => "the_slug"
]

What I need to do is convert it to a multidimensional array that would look something like this:

array:2 [
    "test1" => [
        "test2" => [
            "test3" => "result"
        ]
    ]
    "category" => [
        "slug" => "the_slug"
    ]
]

I know that I can explode on the key to get an array but am unsure of how to then go from this to end up with the final result.

EDIT The array looks like that initially because it's being pulled from request parameters: http://url.com?test1.test2.test3=result&category.slug=the_slug and Laravel auto converts it to an array.

Answer 1

My approach would be to reverse the array, then loop through the keys and nest them.

The code below should do the trick.

$array = [
    "test1_test2_test3" => "result",
    "category_slug" => "the_slug"
];

$array = array_map(function ($key, $value) {
    $keys = array_reverse(explode('_', $key));
    while($key = array_shift($keys)) {
        $value = [$key => $value];
    }

    return $value;
}, array_keys($array), $array);

$array = call_user_func_array('array_merge', $array);
var_dump($array);

/**
array(2) {
    ["test1"]=>
    array(1) {
        ["test2"]=>
        array(1) {
            ["test3"]=>
            string(6) "result"
        }
    }
    ["category"]=>
    array(1) {
        ["slug"]=>
        string(8) "the_slug"
    }
}
*/