Calculating Median of an array in PHP

$limit = 30;  // how many random numbers do you want?  30 or 31?
for ($i = 0; $i < $limit; ++$i) {
    $numbers[] = rand(0, 100);
}
var_export($numbers);

//echo "\n---\nAverage: " , array_sum($numbers) / $limit;
echo "\n---\n";

sort($numbers);
$count = sizeof($numbers);   // cache the count
$index = floor($count/2);  // cache the index
if (!$count) {
    echo "no values";
} elseif ($count & 1) {    // count is odd
    echo $numbers[$index];
} else {                   // count is even
    echo ($numbers[$index-1] + $numbers[$index]) / 2;
}

array (
  0 => 27,
  1 => 24,
  2 => 84,
  3 => 43,
  4 => 8,
  5 => 51,
  6 => 60,
  7 => 86,
  8 => 9,
  9 => 48,
  10 => 67,
  11 => 20,
  12 => 44,
  13 => 85,
  14 => 6,
  15 => 63,
  16 => 41,
  17 => 32,
  18 => 64,
  19 => 73,
  20 => 43,
  21 => 24,
  22 => 15,
  23 => 19,
  24 => 9,
  25 => 93,
  26 => 88,
  27 => 77,
  28 => 11,
  29 => 54,
)
---
43.5

for ($i = 0; $i < 30; ++$i) {
    $numbers[] = rand(0, 100);
}
sort($numbers);
echo ($numbers[14] + $numbers[15]) / 2;