<?php
$sentence = 'Jumpy Qbert grawlix';
$usage = count_chars(strtolower($sentence), 3);
$alphabet = range('a', 'z');
var_export([
'Sentence' => $sentence,
'Total Length' => strlen($sentence),
'Alphabetical Length' => preg_match_all('~[a-z]~', $sentence, $letters),
'Unused Letters' => array_diff($alphabet, $letters),
'Duplicated Letters' => array_diff(array_count_values($letters), [1]),
]);
preferences:
56.64 ms | 402 KiB | 5 Q