Interview answer

Answer.php

<?php

function most_letters_in_a_word($string) {
    $string = preg_replace("/[^A-Za-z]/", ' ', $string);
    
    foreach(array_filter(explode(' ', $string)) as $word) {
        $words[max(count_chars($word, 1))] = $word;
    }
    
    return $words[max(array_keys($words))];
}

var_dump(most_letters_in_a_word("O Romeo, Romeo! Wherefore art thou Romeo?")); // string 'Wherefore' (length=9)

Question.txt

Write a function that takes in a string and returns the 
word that has the most repeated single letter out of all 
the words in the string.

Given the string "O Romeo, Romeo! Wherefore art thou Romeo?"

Your function should return "wherefore" since the letter 'e'
is repeated most often.

** strip non alphabetic characters