How to find the maximum element of an array?

Question

PHP

How to find out which of the elements 100, 75, 50, 25 has the greatest value and how to work with this element and its components in the future? In general, did I collect a three-dimensional array correctly?
the code:

$k = 0;
  for ($i = 0; $i <= $arr1; $i++)
    {
      for ($j = 0; $j <= $arr2; $j++)
        {				
          if ($arr_so[$i][1] == $arr_sr[$j][1])
            {
              if ($arr_so[$i][9] == $arr_sr[$j][7]) $arr_find['100'][$k] = $arr_so[$i];
              if ($arr_so[$i][11] == $arr_sr[$j][9]) $arr_find['75'][$k] = $arr_so[$i];
              echo $arr_find['100'][$k][0];
              echo $arr_find['75'][$k][0];							
            };
          if ($arr_so[$i][10] == $arr_sr[$j][9])
            {
              if ($arr_so[$i][9] == $arr_sr[$j][7]) $arr_find['50'][$k] = $arr_so[$i];
              if ($arr_so[$i][11] == $arr_sr[$j][9]) $arr_find['25'][$k] = $arr_so[$i];
              echo $arr_find['50'][$k][0];
              echo $arr_find['25'][$k][0];	
            };
          $k++;
        };
    };

Answer 1

var max = Math.max.apply(null,[100, 75, 50, 25]);