gistfile1.txt

$question = new Question();
$question->answers = "wefwef";
$question->answers = [
            "wefwefwe",
            "wefdwefwef",
            "wefwefwef"
];

// Геттер и сеттер
 public function getAnswers($value)
    {
        return explode('|', $value);
    }

    public function setAnswers($value)
    {
        $this->attributes['answers'] = implode('|', $value);
    }