Ben aşağıdaki kodu aşağıdaki hatayı alıyorum:

Class primeField implements field {
    private $intmodulus = '';
    public function generator(){
        return ;
    }

    public function modulus(){
        return $this->$intmodulus;
    }
    public function __construct($modulus , $base=0) {
        if (is_resource($modulus) && get_resource_type($modulus) == "GMP integer"){
            $this->$intmodulus = $modulus;
        } else{
            $this->$intmodulus = gmp_init($modulus , $base); \\line 70
        }
    }
}
$a = new primeField(11);
$a->modulus();

Notice: Undefined variable: intmodulus in /Users/admin/PHP ECC/finitefield.php on line 70 Fatal error: Cannot access empty property in /Users/admin/PHP ECC/finitefield.php on line 70

Neden