$words */ public static function listToPhrase(array $words): string { $words = array_unique($words); if (count($words) === 1) { return reset($words); } if (count($words) === 2) { return implode(" and ", $words); } $last_word = array_pop($words); $phrase = implode(", ", $words); $phrase = "$phrase, and $last_word"; return $phrase; } }