在PHP中的多维数组中从数组中存储相同类型的值？

Question

I have a multidimensional array in php like this:

 Array
 (
 [0] => Array
    (
        [Year_id] => 29
        [Make_id] => 7
        [Model_id] => 34
        [Engine_id] => 19
    )

[1] => Array
    (
        [Year_id] => 30
        [Make_id] => 7
        [Model_id] => 34
        [Engine_id] => 19
    )

[2] => Array
    (
        [Year_id] => 21
        [Make_id] => 7
        [Model_id] => 34
        [Engine_id] => 19
    )

[3] => Array
    (
        [Year_id] => 1
        [Make_id] => 7
        [Model_id] => 34
        [Engine_id] => 19
    )

[4] => Array
    (
        [Year_id] => 2
        [Make_id] => 7
        [Model_id] => 34
        [Engine_id] => 2
    )

[5] => Array
    (
        [Year_id] => 3
        [Make_id] => 7
        [Model_id] => 34
        [Engine_id] => 2
    )

[6] => Array
    (
        [Year_id] => 4
        [Make_id] => 7
        [Model_id] => 34
        [Engine_id] => 2
    )

 )

My code is as follows:

  <?php
      $cars = array
      (
      array("Year_id"=>29, "Make_id"=>7, "Model_id"=>34, "Engine_id"=>19),
      array("Year_id"=>30, "Make_id"=>7, "Model_id"=>34, "Engine_id"=>19),
      array("Year_id"=>21, "Make_id"=>7, "Model_id"=>34, "Engine_id"=>19),
      array("Year_id"=>1, "Make_id"=>7, "Model_id"=>34, "Engine_id"=>19),
      array("Year_id"=>2, "Make_id"=>7, "Model_id"=>34, "Engine_id"=>2),
      array("Year_id"=>3, "Make_id"=>7, "Model_id"=>34, "Engine_id"=>2),
      array("Year_id"=>4, "Make_id"=>7, "Model_id"=>34, "Engine_id"=>2)
      );
   echo '<pre>';
   print_r($cars);
   ?>

In above result, I have four ids named Year_id, Make_id, Model_id and Engine_id. Year_id may change any time but when any of remaining IDs change in value, I want to store those arrays in a separate array and again check for remaining arrays and when any of ID values change except Year_id, store those arrays in a separate array.

Right now it should store first four arrays in a separate array because Engine_id value changes. How to solve it? I am ready for bounty after 2 days.

Answer 1

$i = 0;
$sepr = 0;
$arr = array();
foreach($cars as $car) {
    $k = $i; $k = ($k > 0 ? $k-1 : 0);
    foreach($car as $key => $value) {
        if($key != "Year_id" && $value != $cars[$k][$key]) {
            $sepr++;
        }
    }
    $arr[$sepr][] = $car;
    $i++;
}

print_r($arr);