Need help with sending variables into a function PHP

I am working on a webshop and need help to get an iDeal plugin (payment methode from the Netherlands) working.

I need to send through the amount (price) of the items that need to be payed for. I get the quantity of the items from the previous page like this

$qty = $_POST['qty'];

and make a total price variable like this (2999 is the price, it needs to be in cents so the price is 29,99)

$totaalprijs = 2999 * $qty;
$iAmount = $totaalprijs;

the visitor choses his bank and initiates the payment by pressing on a submit button then this happens

$oIdeal->setIdealAmount ( $iAmount );

It is sending the variable to this function in another php file, checks if the value is numeric of not 0 and send it through to the payment method via another function.

public function setIdealAmount ( $intIdealAmount ) {

  # Is this a valid ideal amount?
  if ( is_numeric ( $intIdealAmount ) && $intIdealAmount > 0 ) {
    $this->idealAmount = $intIdealAmount;    
  }
  else {
    throw new Exception( 'Invalid ideal amount, please check.' );   
  }
   return $this;

}

And here is the problem, when its send through the function it always returns 0 except when I for example do this:

$iAmount = 2999;

I want the total price of the items to be price * qty but it only returns $this when I declare my $iAmount variable like above.

The error message i get is this:

Fat开发者_如何学Cal error: Uncaught exception 'Exception' with message 'Invalid ideal amount, please check.' in /home/spraytanning-express.nl/www/TargetPayIdeal.class.php:154 Stack trace: #0 /home/spraytanning-express.nl/www/betalen.php(116): TargetPayIdeal->setIdealAmount(0) #1 {main} thrown in /home/spraytanning-express.nl/www/TargetPayIdeal.class.php on line 154

Hopefully some of you can help me... And by the way, sorry for my bad english :)

Thanks in advance!

---

Try splitting up your check and explicitly throwing exceptions based on which check failed:

public function setIdealAmount ( $intIdealAmount ) {
    var_dump($intIdealAmount); // see what the value is
    if (!is_numeric($intIdealAmount)) {
           throw new Exception( 'ideal amount not numeric' );   
    }
    if ($intIdealAmount <= 0) {
        throw new Exception('ideal amount <= 0');
    }
    etc...
}

Right now your exception is somewhat useful to show something's wrong, but is useless to explain exactly why something's wrong.

---

If you're not already doing it, you may need to initialize the $idealAmount variable before referring to it with the $this-> object. Also, you may want to do a check that $_POST['qty'] is numeric.