Yii2 model form how to manually create a field?

Question

Yii

Hello everyone!)
In general, there is a news form, a simple form where there is a Title, Description, and metatags, and it became necessary to make a url field, but for it to be automatically created:
It should not be in the layout, it should simply be equal to the Title field.
Here's what's there:

public $title;
public $url;
public $text;
public $keywords;
public $description;

public function rules()
{
    return [
        [['title', 'url', 'text', 'keywords', 'description'], 'filter', 'filter' => 'trim'],
        [['title', 'url', 'text'], 'required'],
        [['url'], 'filter', 'filter' => 'strtolower'],
        [['url'], 'filter', 'filter' => [$this, 'normalizeUrl']]
    ];
}

public function normalizeUrl($value)
{
    return strtr($value, array(' ' => '-', 'а' => 'a', 'б' => 'b', 'в' => 'v', 'г' => 'g', 'д' => 'd', 'е' => 'e', 'ё' => 'e', 'ж' => 'j', 'з' => 'z', 'и' => 'i', 'й' => 'y', 'к' => 'k', 'л' => 'l', 'м' => 'm', 'н' => 'n', 'о' => 'o', 'п' => 'p', 'р' => 'r', 'с' => 's', 'т' => 't', 'у' => 'u', 'ф' => 'f', 'х' => 'h', 'ц' => 'c', 'ч' => 'ch', 'ш' => 'sh', 'щ' => 'shch', 'ы' => 'y', 'э' => 'e', 'ю' => 'yu', 'я' => 'ya', 'ъ' => '', 'ь' => ''));
}

The bottom line is that you need to somehow fill in the url field which is not in the widget with data from the title, how can you implement something like this:
public $url = $this->title;

Answer 1

Good afternoon.
Do you want to make something like Slug?
Then use the built-in SluggableBehavior class .
When using the class, everything is done automatically and there will be no need to sculpt a "rusty fox")))

public function normalizeUrl($value)
{
    return strtr($value, array(' ' => '-', 'а' => 'a', 'б' => 'b', 'в' => 'v', 'г' => 'g', 'д' => 'd', 'е' => 'e', 'ё' => 'e', 'ж' => 'j', 'з' => 'z', 'и' => 'i', 'й' => 'y', 'к' => 'k', 'л' => 'l', 'м' => 'm', 'н' => 'n', 'о' => 'o', 'п' => 'p', 'р' => 'r', 'с' => 's', 'т' => 't', 'у' => 'u', 'ф' => 'f', 'х' => 'h', 'ц' => 'c', 'ч' => 'ch', 'ш' => 'sh', 'щ' => 'shch', 'ы' => 'y', 'э' => 'e', 'ю' => 'yu', 'я' => 'ya', 'ъ' => '', 'ь' => ''));
}