How to find the duplicate and highest value in an array

I have an array like this

array={'a'=>'2','b'=>'5', 'c'=>'6', 'd'=>'6', 'e'=>'2'};

The array value might be differe开发者_运维技巧nt depending on the $_POST variables. My question is how to find the highest value in my array and return the index key. In my case, I need to get 'c' and 'd' and the value of 6. Not sure how to do this. Any helps would be appreciated. Thanks.

$max  = max(array_values($array));
$keys = array_keys($array, $max);

Have a look at arsort which will sort an array in reverse order and maintain index association. So:

arsort($array);

This will end up with the largest values at the top of the array. Depending on what you need array_unique can remove duplicate values from your array.

$array = array(
  'key1' => 22,
  'key2' => 17,
  'key3' => 19,
  'key4' => 21,
  'key5' => 24,
  'key6' => 8,
);

function getHighest($array)
{
   $highest = 0;
   foreach($array as $index => $value)
   {
      if(is_numeric($value) && $value > $highest)
      {
          $highest = $index;
      }
   }
   return $highest;
}

echo getHighest($array); //key5

Or this should do the magic, it would probably be faster than php built-in functions

$maxValue = -1;
$max = array();
foreach ($items as $key => $item) {
    if ($item == $maxValue) {
        $max[] = $key;
    } elseif ($item > $maxValue) {
        $max = array();
        $max[] = $key;
        $maxValue = $item;
    }
}