Hi Guys,

I have a interface and class as follows:

interface Math
{
    public function calculate($value);
}

class Tax implements Math
{
    public function calculate($value, $rate)
    {
        return ($value * (($rate / 100) + 1));
    }
}

So my problem is that the calculate() method in the class has more parameters than that allowed by the interface.

How can I specify that the calculate() method can have multiple parameters, but must have the first $value parameter?

Any ideas?

    This seems to work:

    <?php
interface Test
{
   public function foo($bar);
}

class MyClass implements Test
{
   public function foo($bar)
   {
      if(func_num_args() != 2) {
         throw new Exception("Missing arg");
      }
      $arg2 = func_get_arg(1);
      return $bar + $arg2;
   }
}

$mc = new MyClass();
echo $mc->foo(3, 5); // 8
?>

      I would like to add, though, that to my mind this sort of breaks the "contract" that a interface implies: which is that any class that implements it will have those methods provide the same interface to the calling code, regardless of which implementing class is being used.

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