How to get key-value string from PHP array?

Question

PHP

There is an array

Array
(
    [0] => 31
    [1] => 5
    [2] => 6
    [3] => 4
)

translate into a string
json_encode($a)
I get the result:
[31,5,6,4] The
question is how can I get this result:
{"1":31, "2":5, "3":6, "4":4}

Answer 1

how can i get this result

Increment all keys by one. If an associative array has a key of 0 , this array is converted to json exactly as an array, not as an object.
For example, you can use the following code:

$a = [31, 5, 6, 4];

for ($index = count($a); $index > 0; $index--) {
  $a[$index] = $a[$index - 1];
  unset($a[$index - 1]);
}

ksort($a);

Of course, it is applicable only for ordinary arrays - indexing from zero without gaps.