How to convert flat PHP array to indexed array - php

Question

I have the following array:
'values' => [
'protein_question_0_typing_method' => '38'
'protein_question_0_amount_1' => '1'
'protein_question_0_amount_2' => '2'
'protein_question_0_units_of_measurement' => '17'
'protein_question_1_typing_method' => '39'
'protein_question_1_amount_1' => '2'
'protein_question_1_amount_2' => '2'
'protein_question_1_units_of_measurement' => '17'
'protein_question_2_typing_method' => '42'
'protein_question_2_amount_1' => '2'
'protein_question_2_amount_2' => '2'
'protein_question_2_units_of_measurement' => '17'
'distributionId' => '21'
]
How would I convert into a structure like this?
'values' => [
0 => [
'protein_question_typing_method' => '38',
'protein_question_amount_1' => '1',
'protein_question_amount_2' => '2'
],
1 => [
'protein_question_typing_method' => '42',
'protein_question_amount_1' => '1',
'protein_question_amount_2' => '2'
],
...
'distributionId' => '21'
]
This is what I've tried:
$params = \Yii::$app->request->post();
$length = count($params['values']);
for($i = 0; $i < $length; $i++) {
if(!empty($params['values']['protein_question_' . $i . '_typing_method'])) {
echo $params['values']['protein_question_' . $i . '_typing_method'] . "<br /><hr />";
}
}
The above code just prints the data, the reason I need it in the chunked format is because each chunk will be saved as a new model record in the DB.
So basically just need to convert it to an index array, anyone know the easiest way to do this as looping over the first array would be complicated?
Thanks

Answer 1

Can do
$input = [
'values' => [
'protein_question_0_typing_method' => '38',
'protein_question_0_amount_1' => '1',
'protein_question_0_amount_2' => '2',
'protein_question_0_units_of_measurement' => '17',
'protein_question_1_typing_method' => '39',
'protein_question_1_amount_1' => '2',
'protein_question_1_amount_2' => '2',
'protein_question_1_units_of_measurement' => '17',
'protein_question_2_typing_method' => '42',
'protein_question_2_amount_1' => '2',
'protein_question_2_amount_2' => '2',
'protein_question_2_units_of_measurement' => '17',
'distributionId' => '21'
]
];
$output = [];
foreach ($input["values"] as $key => $value) {
if (preg_match('#^protein_question_(\d+)_(.+)$#', $key, $match)) {
$output[$match[1]]['protein_question_' . $match[2]] = $value;
} else {
$output[$key] = $value;
}
}
var_dump($output);
This will iterate over all the keys in the array and match if the start with protein_question, followed by a number, followed by some text. If so, the number is used as the index in the output to hold the key minus the number along with the value. If it doesnt match, the key and value are put as is.
Will give
array(4) {
[0]=>
array(4) {
["protein_question_typing_method"]=>
string(2) "38"
["protein_question_amount_1"]=>
string(1) "1"
["protein_question_amount_2"]=>
string(1) "2"
["protein_question_units_of_measurement"]=>
string(2) "17"
}
[1]=>
array(4) {
["protein_question_typing_method"]=>
string(2) "39"
["protein_question_amount_1"]=>
string(1) "2"
["protein_question_amount_2"]=>
string(1) "2"
["protein_question_units_of_measurement"]=>
string(2) "17"
}
[2]=>
array(4) {
["protein_question_typing_method"]=>
string(2) "42"
["protein_question_amount_1"]=>
string(1) "2"
["protein_question_amount_2"]=>
string(1) "2"
["protein_question_units_of_measurement"]=>
string(2) "17"
}
["distributionId"]=>
string(2) "21"
}

Answer 2

Here a very basic implementation to get you started, you may want to adjust it to your specific needs:
<?php
$values = [
'protein_question_0_typing_method' => '38',
'protein_question_0_amount_1' => '1',
'protein_question_0_amount_2' => '2',
'protein_question_0_units_of_measurement' => '17',
'protein_question_1_typing_method' => '39',
'protein_question_1_amount_1' => '2',
'protein_question_1_amount_2' => '2',
'protein_question_1_units_of_measurement' => '17',
'protein_question_2_typing_method' => '42',
'protein_question_2_amount_1' => '2',
'protein_question_2_amount_2' => '2',
'protein_question_2_units_of_measurement' => '17',
'distributionId' => '21'
];
function convert($values) {
$result = [];
foreach ($values as $key => $value) {
$matches = [];
$ret = preg_match('~^protein_question_([0-9]+)_~U', $key, $matches);
// Key does not match the pattern protein_question_*_
if ($ret !== 1) {
$result[$key] = $value;
continue;
}
$proteinQuestionID = (int)$matches[1];
// Create key for the this ID
if (!isset($result[$proteinQuestionID])) {
$result[$proteinQuestionID] = [];
}
// Adjust the key...
$key = \substr($key, \strlen('protein_question_'.$proteinQuestionID));
$key = 'protein_question'.$key;
// Append to it...
$result[$proteinQuestionID][$key] = $value;
}
return $result;
}
print_r(convert($values));

Answer 3

did you tried array_chunk($your_array, 4) . it looks this method can help you