How to change the array structure of associative array in Php - php

Question

I want to change my array from, how can i make this kind of a change.
Array (
[0] => 53720
[1] => Array(
['Build Quality'] => 1=>10,
2=>9,
3=>7
['Versatality'] => 1=>9,
2=>8,
3=>7
['value'] => 1=>8,
2=>6,
3=>5
)
);
to:
Array (
53720 =>['Build Quality' => [1=>10,
2=>9,
3=>7],
'Versatality' => [1=>9,
2=>8,
3=>7],
'value' => [1=>8,
2=>6,
3=>5]
]
);
function get_array(){
$factor = array([0] => 'Build Quality' [1] => 'Versatality' [2] => 'Value');
$rank = array([0] => 1=>10,2=>9,3=>7 [1] => 1=>9,2=>8,3=>7 [2] => 1=>8,2=>6,3=>5);
$assoc_array = array_combine($factor, $rank);
$post_id = get_current_post_id(); //gives 53720
$result = array();
array_push($result, $post_id, $assoc_array);
print_r($result);
return $result[$post_id];
/* output: Array ([0] => 53720 [1] => Array (['Build Quality'] => 1=>10,2=>9,3=>7 ['Versatality'] => 1=>9,2=>8,3=>7 ['Value'] => 1=>8,2=>6,3=>5)) */
}

Answer 1

You can add elements to an associative array directly:
$result = [];
$result[$post_id] = $assoc_array;
You can also initiate one with keys and values directly:
$result = [
$post_id => $assoc_array
];
Also keep in mind that not any variable can be used as a key, as stated in the PHP documentation for arrays:
The key can either be an integer or a string. The value can be of any type.