Explode and transpose nominated comma-separated strings of an associative array - php

Question

I have an array with comma-separated values like below:
array:5 [
"manufacturer" => "BB"
"width" => "245,225, ..."
"height" => "45,65, ..."
"diameter" => "19,17, ..."
"type" => "AA"
]
There is no limit to how many comma-separated values there may be, but all 3 of them will have same length.
From this, I want to get transposed output like below:
[
245,
45,
19,
],
[
45,
65,
17
]
So far, I have tried following code.
$mandatoryFields = [
'width',
'height',
'diameter',
];
$finalArray = [];
for ($i = 0; $i < 2; $i+=1) {
foreach ($mandatoryFields as $mandatoryField) {
$fieldArray = explode(',', $executionArray[$mandatoryField]);
$finalArray[] = [
$fieldArray[$i]
];
}
}
dd($finalArray);
But it is returning me:
array:6 [
0 => array:1 [
0 => "245"
]
1 => array:1 [
0 => "45"
]
2 => array:1 [
0 => "19"
]
3 => array:1 [
0 => "225"
]
4 => array:1 [
0 => "65"
]
5 => array:1 [
0 => "17"
]
]

Answer 1

The following logic might help you solve your issue:
<?php
$arr = [
"manufacturer" => "BB",
"width" => "245, 225",
"height" => "45, 65",
"diameter" => "19, 17",
"type" => "AA",
];
foreach ($arr as $key => $val) {
$split[$key] = explode(',', $val);
}
$mandatoryFields = [
'width',
'height',
'diameter',
];
// keep only mandatory fields
$split = array_intersect_key($split, array_flip($mandatoryFields));
$items = count($split[$mandatoryFields[0]]); // number of 'items' per mandatory field
for ($i = 0; $i < $items; $i++) {
$result[$i] = array_column($split, $i);
}
echo '<pre>';
print_r($result);
echo '</pre>';
Output:
Array
(
[0] => Array
(
[0] => 245
[1] => 45
[2] => 19
)
[1] => Array
(
[0] => 225
[1] => 65
[2] => 17
)
)

Answer 2

Essentially, this is an "explode & transpose" task. If the required columns are known, then they can be hardcoded like this: (Demo)
var_export(
array_map(
null,
explode(', ', $arr['width']),
explode(', ', $arr['height']),
explode(', ', $arr['diameter'])
)
);
Output:
array (
0 =>
array (
0 => '245',
1 => '45',
2 => '19',
),
1 =>
array (
0 => '225',
1 => '65',
2 => '17',
),
)
If the columns need to be dynamic, then map the required fields, explode on commas and unpack the generated rows to maintain a functional coding style: (Demo)
var_export(
array_map(
null,
...array_map(
fn($f) => explode(', ', $arr[$f]),
$mandatoryFields
)
)
);