histograma.php

<?php
// https://parzibyte.me/blog
$diccionario = [
    1 => 0,
    2 => 0,
    3 => 0,
    4 => 0,
    5 => 0,
];
$miArray = [1, 2, 1, 3, 3, 1, 2, 1, 5, 1];
foreach ($miArray as $numero) {
    $diccionario[$numero]++;
}
foreach ($diccionario as $clave => $conteo) {
    echo "$clave: ";
    for ($x = 0; $x < $conteo; $x++) {
        echo "*";
    }
    echo "\n";
}