If If and thens

[Falstar]

HI everyone. I've been looking over the manual and I just can't seem to get what I need to work. What I'm looking for is an expression that can evaluate 2 if statements then return something.

All I have working now is one

if (article_get_field('Size') == 'L') {article_set_field('item_number','0900');}

What I want is If (size = L) and Color = Blue Then item # = xxxxx

How do I insert the second "if" in there? Do I need to do something like If (size) = L then $a = L
if (Color) = blue then $b = B etc and then put it together to be something like $a ? $b : Item = xxx?

I think I'm just missing syntax or something small to get me through that last bit - any help would be great!

[NogDog]

I'd probably use an array, rather than a whole bunch of IFs:

$items = array(
   'small' => array(
      'red' => 1001,
      'green' => 1002,
      'blue' => 1003
   ),
   'medium' => array(
      'red' => 1011,
      'green' => 1012,
      'blue' => 1013
   ),
   'large' => array(
      'red' => 1021,
      'green' => 1022,
      'blue' => 1023
   )
);
if(isset($items[$size][$color]))
{
   $item_number = $items[$size][$color];
}
else
{
   // handle error condition here
}

Of course, this would probably best be handled with putting that data in a database instead of in the code, then doing one pretty simple query to get the item number.