Create new array inside a multidimensional array, step up name each cycle - php

Question

Question:
How can I iterate below so it checks existence of key "round_1", next script run it should check existense of key "round_2", etc. Everytime it would encounter that the key is missing it should create the key.
It is working with "round_1" as expected.
<?php
// Create array skeleton.
$array_skeleton = array_fill(1, 3, "");
print_r($array_skeleton);
// Populate the skeleton with random numbers, values [1 to 6].
foreach($array_skeleton as $key => $value) {
$populated_array[$key] = random_int(1, 6);
};
print_r($populated_array);
// Create empty array for purpose to become multidimensional array.
$scorecard = [];
// Check if [round_1] is missing, if so create [round_1] and populate it.
if(!array_key_exists("round_1", $scorecard)) {
echo "round_1 is missing, creating it";
$scorecard["round_1"] = $populated_array;
}
print_r($scorecard);
Outcome works fine as expected, after first script run:
(
[round_1] => Array
(
[1] => 3
[2] => 4
[3] => 1
)
)
Expected outcome, after second script run:
Note! It is correct that the values would be different per each round since they are randomly created.
(
[round_1] => Array
(
[1] => 3
[2] => 4
[3] => 1
)
[round_2] => Array
(
[1] => 1
[2] => 4
[3] => 2
)
)

Answer 1

I think your entire code can be simplify:
first define function for create array with random number:
function createRandomNumberArray($numOfElem, $maxRange) {
for ($i = 0; $i < $numOfElem; $i++)
$res[] = random_int(1, $maxRange);
return $res;
}
Second, assuming your keys are made of "round_#INT#" pattern you can do
$biggest = max(array_map(function ($e) {$p = explode("_", $e); return $p[1];}, array_keys($arr)));
And now do:
$newKey = "round_" . ($biggest + 1);
$scorecard[$newKey] = createRandomNumberArray(3,6);
Reference: array-map, explode, max, random-int