building a MailChimp signup form, get a PHP parse error mystery [closed]

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I'm working with the code I got from http://apidocs.mailchimp.com/api/downloads/ called "MCAPI Simple Subscribe Example code" -- the one with jQuery.

Locally, where the PHP version is 5.3.5, it works just fine. But when I deploy it to production, where the PHP version is which is 5.2.17, I get this error:

Parse error: syntax error, unexpected T_FUNCTION in /home/myperf7/ public_html/inc/store-address.php on line 1

See it in action at http://myperfectbicycle.com/ -- as you can see, this error is not just aesthetic. It prevents the form from collecting the email address successfully.

Any idea what might be causing that? I can provide further phpinfo() details if needed -- just don't want to spam you all. Here are the contents of store-address.php:

    <?php

    function storeAdd开发者_JAVA技巧ress(){

        // Validation
        if(!$_GET['email']){ return "No email address provided"; } 

        if(!preg_match("/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*$/i", $_GET['email'])) {
            return "Email address is invalid"; 
        }

        require_once('MCAPI.class.php');
        // grab an API Key from http://admin.mailchimp.com/account/api/
        $api = new MCAPI('XXXXXXX');

        // grab your List's Unique Id by going to http://admin.mailchimp.com/lists/
        // Click the "settings" link for the list - the Unique Id is at the bottom of that page. 
        $list_id = "XXXXXXX";

        if($api->listSubscribe($list_id, $_GET['email'], '') === true) {
            // It worked!   
            return 'Success! Check your email to confirm sign up.';
        }else{
            // An error ocurred, return error message   
            return 'Error: ' . $api->errorMessage;
        }

    }

    // If being called via ajax, autorun the function
    if(isset($_GET['ajax'])){ echo storeAddress(); }

    ?>

What portion of this code wouldn't work properly in PHP version 5.2? Hmmm...

In the comments somebody asked how the store-address.php file being included; here is it, from my index.php page:

    <form id="signup" action="<?php echo $_SERVER['PHP_SELF']; ?>" method="get">
        <input type="text" value="" name="email" class="email" id="email" placeholder="email address" required="required" />
        <div class="clear">
            <input type="submit" value="Notify me" name="subscribe" class="button"/>
        </div>
        <span id="response"><?php require_once('inc/store-address.php'); if(isset($_GET['submit'])){ echo storeAddress(); } ?></span>
    </form>

---

Given that the error is on line 1, and looking on your site is says:

Parse error: syntax error, unexpected T_STRING in /home/myperf7/public_html/inc/store-address.php on line 1

I would suggest opening up your store-address.php and looking for any random strings, spaces, newlines, etc. on the first line of the file. Also, it might be a good idea to have the storeAddress() response block on multiple lines.

<span id="response"><?php 
require_once('inc/store-address.php'); 
if(isset($_GET['submit'])){ 
    echo storeAddress(); 
} 

?></span>

The require_once() certainly should be on a separate line.