How do I move array child value to parent key? - php

Question

I need some clarity as to what PHP function can achieve what I'm aiming for.
This is a PHP array I have:
Array
(
[0] => Array
(
[id] => 6
[index] => 1
[active] => 1
[name] => MyName
)
[1] => Array
(
[id] => 1
[index] => 2
[active] => 1
[name] => YourName
)
[2] => Array
(
[id] => 2
[index] => 4
[active] => 1
[name] => TheirName
)
}
I want to take the "index" value and make it a KEY of that array parent, so the array would become this:
Array
(
[1] => Array
(
[id] => 6
[index] => 1
[active] => 1
[name] => MyName
)
[2] => Array
(
[id] => 1
[index] => 2
[active] => 1
[name] => YourName
)
[4] => Array
(
[id] => 2
[index] => 4
[active] => 1
[name] => TheirName
)
}
Can anyone please tell me how would I do this in PHP?
Thank you in advance.

Answer 1

you can use: array_column($array, null, 'index');
is the better solution, but only work for >= 5.5 php version

Answer 2

Not the most elegant solution, but it works (it doesn't actually move the array, it just generates a new one that corresponds to your requirements):
$resultArr = array();
foreach ($mainArr as $value) {
$resultArr[$value['index']] = $value;
}
unset($mainArr); // or $mainArr = $resultArr;
This way you won't overwrite any existing keys in your original array.

Answer 3

$a = array
(
0 => array
(
"id" => 6,
"index" => 1,
"active" => 1,
"name" => "MyName"
),
1 => Array
(
"id" => 1,
"index" => 2,
"active" => 1,
"name" => "YourName"
),
2 => Array
(
"id" => 2,
"index" => 4,
"active" => 1,
"name" => "TheirName"
)
);
$newArray = array();
foreach ($a as $foo) {
$newArray[$foo['index']] = $foo;
}

Answer 4

You have to do it manually with:
$input = array( /* your data */ );
$output = array();
foreach ( $input as $values ) {
$output[ $values['index'] ] = $values;
}

Answer 5

public static function normArray($key, $inputArray)
{
$outputArray = array();
foreach ($inputArray as $item) {
$index = intval($item[$key]);
$outputArray[$index] = $item;
}
return $outputArray;
}