Yii2 Postgresql array variables trait

PgArrayTrait.php

<?php

namespace app\components;

use yii\base\InvalidValueException;

/**
 * Class PgArrayTrait
 * @property string[] $arrayFields
 */
trait PgArrayTrait
{

    public function beforeSave($insert)
    {
        //@TODO: Check dirty attributes, don't touch unchanged
        foreach ($this->arrayFields as $name) {
            if (is_array($this->$name)) {
                $this->$name = self::PhpToPgArray($this->$name);
            }
        }
        return parent::beforeSave($insert);
    }

    public function afterSave($insert, $changedAttributes)
    {
        //@TODO: Check dirtynes of attributes, maybe need [[setOldAttribute]] like in [[afterFind]]
        foreach ($this->arrayFields as $name) {
            if (!is_array($this->$name)) {
                $this->$name = self::PgToPhpArray($this->$name);
            }
        }
        return parent::afterSave($insert, $changedAttributes);
    }

    public function afterFind()
    {
        foreach ($this->arrayFields as $name) {
            $this->setOldAttribute($name, $this->$name = self::PgToPhpArray($this->$name));
        }
        parent::afterFind();
    }

    protected static function PhpToPgArray(array $values)
    {
        //@TODO: sanitize it!
        return '{'.implode(',', $values).'}';
    }

    protected static function PgToPhpArray($value)
    {
        if (empty($value)) {
            return [];
        }
        if ($value[0] !== '{' || mb_substr($value, -1) !== '}') {
            throw new InvalidValueException();
        }
        return explode(',', mb_substr($value, 1, -1));
    }
}