<?php
$sifra = [ 100, 200, 100, 90, 30, 200, 44, 100, 90 ];
foreach (array_count_values($sifra) as $key => $val)
//echo '<br>Šifra ' . str_pad($key, 3, ' ', STR_PAD_LEFT) . " se ponavlja $val puta.";
echo 'Šifra ' . str_pad($key, 3, ' ', STR_PAD_LEFT) . " se ponavlja $val puta." . PHP_EOL;