bubble sort multidimensional array php

Question

I have to sort 2d array

   $items = array(
   array(15, 16, 8, 1),
   array(2, 3, 4, 7),
   array(9, 11, 19, 6,)
   );

with bubble sort ant to get something like this

  1,2,3,4
  6,7,8,9
  11,15,16,19

I can't find anywhere bubble sort for multiple arrays. Can you help me?

I tried something like this, but it isn't working:

 $iterations = 0;
 for ($i = 0; $i < count($array); $i++)
 {
   $iterations++;
   $hasSwap = false;
     for ($j = 0; $j < count($array) - 1 - $i; $j++) 
      {
        $iterations++;
            if ($array[$j] > $array[$j + 1]) 
            {
              $hasSwap = true;
              swap($array, $j, $j + 1);
            }
         }

        if (!$hasSwap) 
        {
          break;
        }
   }
   var_dump($iterations);
   print_r($array);

Answer 1

You are treating the three arrays as one. So

1. Create one array out of them
2. Use standard bubble sort
3. Group them into three arrays.

Answer 2

Probably someone will be useful this decision. Here it was necessary to sort the elements by bubbles based on the value of 'COUNT' within each element.

$fruits
(
    [0] => Array
        (
            [NAME] => Banana
            [COUNT] => 7
        )
    [1] => Array
        (
            [NAME] => Orange
            [COUNT] => 2
        )
    [2] => Array
        (
            [NAME] => Apple
            [COUNT] => 24
        )
)

usort($fruits, function($a, $b)
{
    if($a['COUNT'] > $b['COUNT'])
    {
      return -1;
    }
    if($a['COUNT'] < $b['COUNT'])
    {
      return 1;
    }
    return 0;
});

More examples and detailed of using: usort