Problem using mailchimp api

[eon201]

Hey all.

First off as always thanks in advance. I'm no expert when it comes to php so I appreciate the help.

What I'm trying to do:
Send data from my form to Mailchimp api. Specifically email, name and birthday.

What it currently does:
Sends email and name

What it wont do:
Send the birthday

I know I'm doing something stupid here and that it is a simple fix but I just can work it out!

The simple guide to the function I'm using from the api is here > http://apidocs.mailchimp.com/api/1.3...cribe.func.php

As you can see it prefers to have the birthday in the MM/DD format.

PHP Code:

$month = $_POST['Month'];
$year = $_POST['Year'];

//Create Birthday in mm/dd format for mailchimp
$birthday = $month."/".$day; 


I then use the function to send the data (which as I mentioned above works for everything APART from the birthday!

PHP Code:

function SubscribeToList($listId, $name, $email)
{
 global $apiKey;
 $api = new MCAPI($apiKey);
 $parsedName = ParseName($name);
 
$mergeVars = array('FNAME' => $parsedName['first'], 'LNAME' => $parsedName['last'], 'birthday'=>"$birthday");
 
 $success = $api->listSubscribe($listId, $email, $mergeVars, 'html', false);
 return $success; 
} 


I get the feeling this is me using the wrong syntax, but I've been trying to get this to work for about two days!

What am I doing wrong here?

Many thanks,

[eon201]

Specifically I think it's a problem with this line:

PHP Code:

$mergeVars = array('FNAME' => $parsedName['first'], 'LNAME' => $parsedName['last'], 'birthday' => $birthday); 


[eon201]

I have narrowed it down now.

If I use this line I get the birthday appearing in Mailchimp.

PHP Code:

$mergeVars = array('FNAME' => $parsedName['first'], 'LNAME' => $parsedName['last'], 'BDAY'=>"04/04"); 


But then if I try to inject the string it doesn't work. I must be doing a stupid syntax thing here?

PHP Code:

$mergeVars = array('FNAME' => $parsedName['first'], 'LNAME' => $parsedName['last'], 'BDAY'=>"$birthday"); 


Thanks,