Sorting

<?php

$inputArr = [2, 2, 2, 2, 3, 3, 3, 1, 1, 1, 6, 6, 5, 5, 5];
$arr = [];
foreach ($inputArr as $item) {
    if (key_exists($item, $arr)) {
        $arr[$item]++;
    } else {
        $arr[$item] = 1;
    }
}
ksort($arr);
asort($arr);
foreach ($arr as $number=>$repeats){
    echo str_repeat($number." ",$repeats); // 6 6 1 1 1 3 3 3 5 5 5 2 2 2 2
}