Re: optional argument when creating a function

["Matthew Weier O'Phinney" <mweierophinney@xxxxxxxxx>]

* D A GERM <dgerm@xxxxxxxxxxxx>:
> I'm throwing a warning on a function I created. I
> thought a & in front of the argument was supposed to
> make it optional. Is there something else I need to do
> make that argument optional?

As others have noted, the ampersand tells the function to grab a
reference to the variable passed.

There are two ways to do optional arguments:

1) Set a default value for the argument (must be last argument in the
   list, or else all other arguments in the list must also have default
   values):

   function doEmail($username, $link = null) {}
   function doEmail($username, $link = null, $linkName = '') {}

2) Parse the argument list via the func_* functions:

   function doEmail($username)
   {
       $argCount = func_num_args();
       if (1 < $argCount) {
           // Retrieve second argument, from a 0-based array:
           $link = func_get_arg(1);
       }
       ...
   }

   function doEmail($username)
   {
       $argCount = func_num_args();
       if (1 < $argCount) {
           // Retrieve all arguments
           $args = func_get_args();
           
           // Remove $username from it
           array_shift($args);

           // Get $link:
           $link = array_shift($args);
       }
       ...
   }


-- 
Matthew Weier O'Phinney
Zend Certified Engineer
http://weierophinney.net/matthew/

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