Simple PHP calculator

Question

I\'m creating a basic PHP calculator that lets you enter two values and chose your operator then displays the answer. Everything is working fine except it\'s not outputting

Answer 1

a + $this->b;
            break;

            case '-':
            return $this->a - $this->b;
            break;

            case '*':
            return $this->a * $this->b;
            break;

            case '/':
            return $this->a / $this->b;
            break;

            default:
            return "Sorry No command found";
        }   
    }
    function getresult($a, $b, $c)
    {
        $this->a = $a;
        $this->b = $b;
        return $this->checkopration($c);
    }
}

$cal = new calculator();
if(isset($_POST['submit']))
{   
    $result = $cal->getresult($_POST['n1'],$_POST['n2'],$_POST['op']);
}
?>



    

        

    
    

        
Enter 1st Number
        

    

    

        
Enter 2nd Number
        

    

    

        
Select Oprator
        

            +
            -
            *
            /