Full script for the Google Developer Day Quiz (with tests)

developerquiz.php

<?php

const FOO_LETTERS = 'aeiou'; //Letras especiais do Googlon
const PREP_INV = 'z'; //Letra que invalida preposições
const PREP_SIZE = 3; //Tamanho das preposições
const VERB_SIZE = 8; //Tamanho do verbo
const LETTER_ORDERING = 'qnbczxjtklmvhrwfsdgp'; //Ordem das letras
const GOOGLON_NUMBER_MOD = 4; //Divisor do número bonito
const GOOGLON_NUMBER_MAX = 526593; //Menor número bonito possível

$textA = '';
$textB = '';
$textAOrdered = '';
$textB = explode(' ', $textB);
$textA = explode(' ', $textA);
$textAOrdered = explode(' ', $textAOrdered);
$textAPreps = 62;
$textAVerbs = 18;
$textAFirstPersonVerbs = 4;
$googlonNumber = 'xgjkxcj';
$decimalNumber = '394410765';
$textANiceNumbers = 125;
$textBPreps = count(array_filter($textB, 'googlon_is_prep'));
$textBVerbs = count(array_filter($textB, 'googlon_is_verb'));
$textBFirstPersonVerbs = count(array_filter($textB, 'googlon_is_first_person_verb'));
$textBNiceNumbers = count(array_unique(array_filter($textB, 'googlon_is_nice_number')));
$textBVocab = array_unique($textB);
googlon_sort($textBVocab);
$textBVocab = implode(' ', $textBVocab);

$test = array_unique($textA);
googlon_sort($test);
assert($textAOrdered === $test);
assert($decimalNumber === googlon_number($googlonNumber));
assert($textAPreps === count(array_filter($textA, 'googlon_is_prep')));
assert($textAVerbs === count(array_filter($textA, 'googlon_is_verb')));
assert($textAFirstPersonVerbs === count(array_filter($textA, 'googlon_is_first_person_verb')));
assert($textANiceNumbers === count(array_unique(array_filter($textA, 'googlon_is_nice_number'))));

print_r(compact('textBPreps', 'textBVerbs', 'textBFirstPersonVerbs', 'textBNiceNumbers', 'textBVocab'));

function googlon_is_prep($word) {
    return PREP_SIZE === strlen($word)
        && false === stripos(FOO_LETTERS, substr($word, -1, 1))
        && false === stripos($word, PREP_INV);
}
function googlon_is_verb($word) {
    return strlen($word) >= VERB_SIZE && false !== stripos(FOO_LETTERS, substr($word, -1, 1));
}
function googlon_is_first_person_verb($word) {
    return googlon_is_verb($word) && false !== stripos(FOO_LETTERS, substr($word, 0, 1));
}
function googlon_hack($word) {
    return strtr($word, LETTER_ORDERING, '0123456789abcdefghij');
}
function googlon_sort(array &$words) {
    return usort($words, function($a, $b) {
        return strcasecmp(googlon_hack($a), googlon_hack($b));
    });
}
function googlon_number($number) {
    return base_convert(strrev(googlon_hack($number)), 20, 10);
}
function googlon_is_nice_number($number) { 
    $number = googlon_number($number);
    return (int) bcmod($number, GOOGLON_NUMBER_MOD) === 0 && $number >= GOOGLON_NUMBER_MAX;
}