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Skeletal PHP Script to Update an Existing Contact via a PUT.

<?php
/*A very simple example on how to update a contact name using a PUT command.  To run  
this script, provide your own Constant Contact User Name (UN), Password (PW), API Key (Key)  
and Contact ID (SubID).  Then provide an appropriate set  of corresponding Contact details 
including EmailAddress and Contact List ID (or series of  Contact  List IDs).  Valid Contact ID and 
Contact List IDs must be determined via an API Call (not Shown) */

$UN = "yourconstantcontactusername";
$PW = "yourconstantcontactpassword";
$Key = "yourconstantcontactAPIKey";
$SubID ="77898" ;//REPLACE WITH A VALID CONTACT Id, Which you can retrieve with a GET

 $entry = '<entry xmlns="http://www.w3.org/2005/Atom">
  <id>http://api.constantcontact.com/ws/customers/'.$UN.'/contacts/'.$SubID.'</id>
  <title type="text">Contact: test13420001000@3examghfghplexcvxc.com</title>
  <updated>2008-04-25T19:29:06.096Z</updated>
  <author><name>Mike</name></author>
  <content type="application/vnd.ctct+xml">
  <Contact xmlns="http://ws.constantcontact.com/ns/1.0/" id="http://api.constantcontact.com/ws/customers/'.$UN.'/contacts/'.$SubID.'">
      <EmailAddress>test13420001000@3examghfghplexcvxc.com</EmailAddress>
      <FirstName>Joe6</FirstName>
      <LastName>Smith6</LastName>
      <OptInSource>ACTION_BY_CUSTOMER</OptInSource>
      <ContactLists>
        <ContactList id="http://api.constantcontact.com/ws/customers/'.$UN.'/lists/7">
        </ContactList>
      </ContactLists>
    </Contact>
  </content>
</entry>';

/*
    The XML above will change the First name and Last name to  Joe6 Smith6 Need to make
    sure you have listed all the lists the contact belongs to, in addition to any lists you would like 
    the Contact added to.  If you leave a Contact List out, the Contact will be removed from that 
    Contact List.  This is format of Contact List XML entries:
    <ContactLists>
            <ContactList id="http://api.constantcontact.com/ws/customers/'.$UN.'/lists/7">
            </ContactList>
            <ContactList id="http://api.constantcontact.com/ws/customers/'.$UN.'/lists/55">
            </ContactList>
            <ContactList id="http://api.constantcontact.com/ws/customers/'.$UN.'/lists/57"> 
            </ContactList>
    </ContactLists>
*/

// create a temp file and load the xml in to it.
$tmpfile = tmpfile();
fwrite($tmpfile, $entry);
fseek($tmpfile, 0);

// Initialize the curl session
$request ="http://api.constantcontact.com/ws/customers/".$UN."/contacts/".$SubID;
$session = curl_init($request);

// Set up Digest authentication. Put your API key, and CTCT username/pwd here 
$userNamePassword = $Key . '%' . $UN . ':' . $PW ;

curl_setopt($session, CURLOPT_HTTPAUTH, CURLAUTH_DIGEST); 
curl_setopt($session, CURLOPT_USERPWD, $userNamePassword); 
curl_setopt($session, CURLOPT_INFILE, $tmpfile); 
fclose($tmpfile); // Close temp file because it no longer needed

curl_setopt($session, CURLOPT_PUT, 1);
curl_setopt($session, CURLOPT_INFILESIZE, strlen($entry)); 
curl_setopt($session, CURLOPT_HTTPHEADER, Array("Content-Type:application/atom+xml"));
curl_setopt($session, CURLOPT_HEADER, false);   // Do not return headers
curl_setopt($session, CURLOPT_RETURNTRANSFER, 0); 
$response = curl_exec($session); 
$httpcode = curl_getinfo($session, CURLINFO_HTTP_CODE); 
curl_close($session); 

if ($httpcode > 199 && $httpcode < 300) 
    { 
echo  "It works!!" ; // You might want GET the updated Contact and display it
 } 
else 
   { echo "<br> There a Problem <br>Error Code: ". $httpcode ; }

?>

Comments, additions and corrections encouraged!
Thanks,
Mike C, Constant Contact Support Engineer