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<?php function groupBySameLetters(array $words): array { $groups = []; $countGroups = []; foreach ($words as $word) { $letters = mb_str_split($word); sort($letters); $key = implode('', $letters); $groups[$key][] = $word; $countGroups[$key] ++; } return array_values($groups); } // Приклад використання: $input = ['ab', 'ac', 'ba', 'ca']; $result = groupBySameLetters($input); print_r($result);
Output for git.master, git.master_jit
Warning: Undefined array key "ab" in /in/KQncr on line 14 Warning: Undefined array key "ac" in /in/KQncr on line 14 Array ( [0] => Array ( [0] => ab [1] => ba ) [1] => Array ( [0] => ac [1] => ca ) )

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