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#1 楼

/**
 * Adapted from Victor T.'s answer
 */
function array_median($array) {
  // perhaps all non numeric values should filtered out of $array here?
  $iCount = count($array);
  if ($iCount == 0) {
    throw new DomainException('Median of an empty array is undefined');
  }
  // if we're down here it must mean $array
  // has at least 1 item in the array.
  $middle_index = floor($iCount / 2);
  sort($array, SORT_NUMERIC);
  $median = $array[$middle_index]; // assume an odd # of items
  // Handle the even case by averaging the middle 2 items
  if ($iCount % 2 == 0) {
    $median = ($median + $array[$middle_index - 1]) / 2;
  }
  return $median;
}

/**
 * The name should probably be changed, to reflect more your business intent.
 */
private function calculateMedian($aValues) {
  return array_median(
    array_filter(
      $aValues, 
      function($v) {return (is_numeric($v) && $v >= 0);}
      // You can skip is_numeric() check here, if you know all values in $aValues are actually numeric 
    )
  );
}

#2 楼

private function calculateMedian($aValues) {
    $aToCareAbout = array();
    foreach ($aValues as $mValue) {
        if ($mValue >= 0) {
            $aToCareAbout[] = $mValue;
        }
    }
    $iCount = count($aToCareAbout);
    if ($iCount == 0) return 0;

    // if we're down here it must mean $aToCareAbout
    // has at least 1 item in the array.
    $middle_index = floor($iCount / 2);
    sort($aToCareAbout, SORT_NUMERIC);
    $median = $aToCareAbout[$middle_index]; // assume an odd # of items

    // Handle the even case by averaging the middle 2 items
    if ($iCount % 2 == 0)
        $median = ($median + $aToCareAbout[$middle_index - 1]) / 2;

    return $median;
}

#3 楼

function calculateMedian($Values)
{
    //Remove array items less than 1
    $Values = array_filter($Values,array($this,"callback"));

    //Sort the array into descending order 1 - ?
    sort($Values, SORT_NUMERIC);

    //Find out the total amount of elements in the array
    $Count = count($Values);

    //Check the amount of remainders to calculate odd/even
    if($Count % 2 == 0)
    {
        return $Values[$Count / 2];
    }

    return (($Values[($Count / 2)] + $Values[($Count / 2) - 1]) / 2);
}

if(array_keys($Values) !== range(0,($Count-1)))
{
    return null;
}

$values = array(
    0,4,7,5,6,9,5,3,2,7,5,6,4,3,7
);
echo calculateMedian($values);