从两个数组创建多维数组

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.

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

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);

PHP Docs for array_combine here.

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];
}