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Using non request variable in validation. - z10892 - 06-29-2020

Can I create new variable inside controller that will be used in validation placeholder?



PHP Code:
$id 1//this way or by adding request variable
$_POST['id'] = 1//this doesn't seems to work.
$validation->setRules([
    'email' => 'required|valid_email|is_unique[users.email,id,{id}]'
]); 

I can't figure it out and also wasn't able to find any answers.