Group 2d array data using column value to create a 3d array

arrays, grouping, multidimensional-array, php

Solution

You need to group them by level first

Use foreach to loop into array check if the level is the same with the previous item then group it with that array

  $templevel=0;   

  $newkey=0;

  $grouparr[$templevel]="";

  foreach ($items as $key => $val) {
   if ($templevel==$val['level']){
     $grouparr[$templevel][$newkey]=$val;
   } else {
     $grouparr[$val['level']][$newkey]=$val;
   }
     $newkey++;       
  }
print($grouparr);

The output of print($grouparr); will display like the format you hoped for

You can also try to

print($grouparr[7]);

Will display

 [7] => Array (
      [4] => Array (
             [cust] => XT7434
             [type] => standard
             )
      )

Or

print($grouparr[3]);

Will display

[3] => Array (
      [2] => Array (
             [cust] => XT8922
             [type] => premier
             )

      [3] => Array (
             [cust] => XT8816
             [type] => permier
             )
      )

Problem

I have a multidimensional array and am trying to group them according to the value in a specific column. I'm trying to group them by `level`, but I won't actually know the level beforehand. So, it's not like I can put it in a `for` loop and say `while $i < 7`, because I won't know that `7` is the maximum value for the level key, and frankly, I'm not sure that's how I would need to do it even if I did. ``` [ ['cust' => 'XT8900', 'type' => 'standard', 'level' => 1], ['cust' => 'XT8944', 'type' => 'standard', 'level' => 1], ['cust' => 'XT8922', 'type' => 'premier', 'level' => 3], ['cust' => 'XT8816', 'type' => 'permier', 'level' => 3], ['cust' => 'XT7434', 'type' => 'standard', 'level' => 7], ] ``` Desired result: ``` Array ( [1] => Array ( [0] => Array ( [cust] => XT8900 [type] => standard ) [1] => Array ( [cust] => XT8944 [type] => standard ) ) [3] => Array ( [2] => Array ( [cust] => XT8922 [type] => premier ) [3] => Array ( [cust] => XT8816 [type] => permier ) ) [7] => Array ( [4] => Array ( [cust] => XT7434 [type] => standard ) ) ) ```

Original source