<?php
function get_array_group_of_words(array $words) {
usort($words, function($a, $b) {
return strlen($b) - strlen($a);
});
$group_of_words = [];
$this_group = false;
foreach($words as $key => $value) {
if (!is_string($value))
throw new \InvalidArgumentException('Массив может содержать только строки.');
if ($this_group) {
$last = array_pop($group_of_words);
$last[] = $value;
array_push($group_of_words, $last);
} else {
$group_of_words[] = [$value];
}
if (isset($words[$key+1])) {
$word1 = preg_split('/(?<!^)(?!$)/u', mb_strtolower($value));
sort($word1);
$word2 = preg_split('/(?<!^)(?!$)/u', mb_strtolower($words[$key+1]));
sort($word2);
if (strcmp(implode('', $word1), implode('', $word2)) == 0) {
$this_group = true;
} else {
$this_group = false;
}
}
}
return $group_of_words;
}
// hash as sorted chars of word
// i.e. 'ababcad' -> 'aabbcd'
function word_hash($word) {
$chars = str_split($word);
sort($chars);
return implode($chars);
}
// return grouped by word_hash array of words
function get_words_grouped_by_chars($words) {
$hashes = [];
$group_of_words = [];
foreach($words as $key => $value) {
if (!is_string($value))
throw new \InvalidArgumentException('Массив может содержать только строки.');
$hash = word_hash($value);
if (!array_key_exists($hash, $hashes)) {
$hashes[$hash] = $value;
$group_of_words[$hashes[$hash]] = [];
}
array_push($group_of_words[$hashes[$hash]], $value);
}
uksort($group_of_words, function($a, $b) { return strlen($b) - strlen($a); });
return array_values($group_of_words);
}
