find the median of all keys in a map in php

main.php
$map = ['a' => 1, 'b' => 2, 'c' => 3, 'd' => 4, 'e' => 5]; //sample map

$keys = array_keys($map); //extract keys and store them in an array

sort($keys); //sort the array of keys

$count = count($keys); //get the count of keys

if ($count % 2 == 0) { //if the count is even
    $median = ($keys[($count/2)-1] + $keys[$count/2]) / 2; //calculate the median
} else { //if the count is odd
    $median = $keys[(int) ($count/2)]; //calculate the median
}

echo $median; //print the median
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