How to group a multidimensional array by multiple subarray values? - php

Question

I checked this question and answers:
How to group a multidimensional array by a particular subarray value?
He wanted to group results by 'level'. But how would you do it to group it by 'level' first and then by 'type'?

Answer 1

Its pretty straight forward. Loop through $items array. Get each item's level and type and if they are not set yet, initialize them with an empty array. Then just push the "cust" value into the array.
I have given the code below.
I am assuming "$items" is an array which contains the input.
$g = [];
foreach($items as $k => $v) {
$l = $v["level"];
$t = $v["type"];
$c = $v["cust"];
if(!isset($g[$l])) {
$g[$l] = [];
}
if(!isset($g[$l][$t])) {
$g[$l][$t] = [];
}
$g[$l][$t][] = [
"cust" => $c
];
}
var_dump($g);
The output of this code would be like below:
array(3) {
[1]=>
array(1) {
["standard"]=>
array(2) {
[0]=>
array(1) {
["cust"]=>
string(6) "XT8900"
}
[1]=>
array(1) {
["cust"]=>
string(6) "XT8944"
}
}
}
[3]=>
array(1) {
["premier"]=>
array(2) {
[0]=>
array(1) {
["cust"]=>
string(6) "XT8922"
}
[1]=>
array(1) {
["cust"]=>
string(6) "XT8816"
}
}
}
[7]=>
array(1) {
["standard"]=>
array(1) {
[0]=>
array(1) {
["cust"]=>
string(6) "XT7434"
}
}
}
}
[P.S.]: You can also use sort to solve this problem easily. That's another way of solving this problem.