Creating a multi dimensional Array from two arrays

Question

I have the following 2 arrays:

 Array 1
(
    [0] => Speed
    [1] => Grade
    [2] => Speed
    [3] => Grade
    [4] => Speed
    [5] => Grade
    [6] => Grade
    [7] => Speed
    [8] => Size
)

Array 2
(
    [0] => 5200 rpm
    [1] => Red
    [2] => 7200 rpm
    [3] => Blue
    [4] => 8900 rpm
    [5] => Green
    [6] => Purple
    [7] => 10000 rpm
    [8] => Big
)

The values are matching each other. For example: Speed - 5200 rpm , Grade - Red and so forth.

I need to make the above like the following :

$collection = array( 

        "Speed" => array (
           5200 rpm,
           7200 rpm,    
           8900 rpm,
           10000 rpm
        ),

        "Grade" => array (
           Red,
           Blue,
           Green,
           Purple
        ),

        "Size" => array (
           Big
        )
     );

It needs to make an array for each label and store the necessary values into the array. I have tried merging and combining and looping. I am going wrong somewhere.

Can someone please help me out.

Please edit your question and include the code you have tried that is not working as expected. — Dave
– Dave, Commented Mar 4, 2019 at 14:57
for($i=0; $i<count($array); $i++) { if(!isset($new_array[$array[$i]]) {$new_array[$array[$i]] = [];} $new_array[$array[$i]][] = $array2[$i];} — Frankich
– Frankich, Commented Mar 4, 2019 at 14:59

Davide · Accepted Answer · 2019-03-04 15:01:22Z

1

Try this code

$array_1 = array('Speed','Grade','Speed','Grade','Speed','Grade','Grade','Speed','Size');
$array_2 = array('5200 rpm','Red','7200 rpm','Blue','8900 rpm','Green','Purple','10000 rpm','Big');

foreach($array_1 as $key=>$elm){
    $finalArray[$elm][] = $array_2[$key];
}

echo("<pre>");
print_r($finalArray);
echo("</pre>");

With foreach you can use label for create new array multi-dimensional! Is very easy. I hope I have helped you, for any questions, please comment

answered Mar 4, 2019 at 15:01

Davide

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2 Comments

Juan J Over a year ago

Exactly what I was looking for! Is it possible to explain to me this part $finalArray[$elm][] = $array_2[$key]; Thank you so much!

Davide Over a year ago

@JuanJ Hello, thank you for choosing my answer as best. Then the $ finalArray variable is clearly new. And use it to form the array as you want it. I then create the array with key the cycle of array_1. Then foreach all the values of array_1 creating the $ key label (Speed, Grade, ..). Then I associate the value of the array_2 to that key. That [] is to always create a new element to the array. In fact, if you remove it you will see that the final array is simply 1 key-> value. And it does not include all the data!

Olawale · Accepted Answer · 2019-03-04 15:23:57Z

0

Save array 1 as $description and array 2 as $value.

You need to get the array values of both arrays, using:

$description = array_values($description);

And then you can use array_combine.

$combined = array_combine($description, $value);

Related (for array values) Convert an associative array to a simple array of its values in php

PHP Docs for array_combine here.

edited Mar 4, 2019 at 15:23

Olawale

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answered Mar 4, 2019 at 15:00

party-ring

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1 Comment

dWinder Over a year ago

But array value only take one value for each key (look a the your doc link) - NOT what the OP wanted

AythaNzt · Accepted Answer · 2019-03-04 15:14:52Z

-1

EDIT

I read the question again and I see that index are the same for array 1 and array 2

$collection = array();
foreach (array1 as $key => $value){
    $collection[$value][] = $array2[$key];
}

edited Mar 4, 2019 at 15:14

answered Mar 4, 2019 at 15:05

AythaNzt

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