Laravel - adapt the table according to the cases

i thinking if is it possible to make a function that do somethink like this in Laravel

public function getUsers( $select, $where )
{
    return User::where( $where )->get( $select );
}

if $select = "*" and $where =""", it gives all users if $select = "columns" and $where="conditions", this gives the specific columns that meet the conditions. if...

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