How to use is_unique?

I have a controller with code:

PHP Code:

...... other code .....
$props['login'] = 'test';
$props['mail'] = '[email protected]';

$this->validation->run($props, 'myrules');
...... other code ...... 


And now....In my app/Config/Validation.php I write next property:

PHP Code:

public $myrules = [
        'login' => "is_unique[admins.login,id,{id}]",
        'mail'  => 'is_unique[admins.mail,id,{id}]',
          ] 


How I can transfer in THIS rule my VARIABLE WITH user ID??!!!

I want to GET the next code (as example):

PHP Code:

public $myrules = [
        'login' => "is_unique[admins.login,id,314]",
                'mail'  => 'is_unique[admins.mail,id,314]',

    ];

// and next will GET query
// SELECT 1 FROM admins WHERE login = 'test' AND id != 314 


My QUESTION: "HOW TO SEND VARIABLE VALUE IN THE LAST ARGUMENT FROM MY CONTROLLER DINAMICALLY?"