Hackerrank challenge - Birthday Cake Candles - https://www.hackerrank.com/challenges/birthday-cake-candles/problem

birthdayCakeCandles.php

function birthdayCakeCandles($ar) {
    $candles = array_count_values($ar);
    ksort($candles);
    $candleLast = array_key_last($candles);

    $tallestCandels = $candles[$candleLast];

    return $tallestCandels;
}