I am attempting to run some of the code samples but not getting the
meaningful responses. For example, check_keyword_traffic.php (found
here: 
http://code.google.com/p/adwords-api-php-samples/source/browse/trunk/src/check_keyword_traffic.php)
returns this:

Estimate for keyword "mars cruise" is "HasTraffic".

If I change the keyword to check to 'dgosdle45ds' the return is:

Estimate for keyword "dgosdle45ds" is "HasTraffic".

It seems the estimate is "HasTraffic" regardless of the keyword. The
specific change made to the sample in this case was:

# Create keyword structure.
$keyword =
  '<keywordText>dgosdle45ds</keywordText>' .
  '<keywordType>Exact</keywordType>' .
  '<language>en</language>';

An issue in general with all of the PHP sample code is the suggested
format of the login information. The code provided is:

# Provide AdWords login information.
$email = 'INSERT_LOGIN_EMAIL_HERE';
$password = 'INSERT_PASSWORD_HERE';
$client_email = 'INSERT_CLIENT_LOGIN_EMAIL_HERE';
$useragent = 'INSERT_COMPANY_NAME: AdWords API PHP Sample Code';
$developer_token = 'INSERT_DEVELOPER_TOKEN_HERE';
$application_token = 'INSERT_APPLICATION_TOKEN_HERE';

However, because the samples use the sandbox, as indicated by this
string:

$namespace = 'https://sandbox.google.com/api/adwords/v12';

The format must be as suggested by Jeff Watson earlier in this post:

$email = '[EMAIL PROTECTED]'; // My Client Center login email
$password = 'xxx';  // My Client Center login password
$client_email =
'[EMAIL PROTECTED]<[EMAIL PROTECTED]>';
 // the login email of
one of the clients being managed in My Client Center
$useragent = 'AdWords API PHP Sample Code';
$developer_token = '[EMAIL PROTECTED]';
$application_token = 'myapptoken';

This allows my edited samples to run without error, but so far seems
to return no data for any of the five different samples I've run. I
turned debug on which returns:

POST /api/adwords/v12/TrafficEstimatorService HTTP/1.0 Host:
sandbox.google.com User-Agent: NuSOAP/0.7.3 (1.114) Content-Type: text/
xml; charset=ISO-8859-1 SOAPAction: "" Content-Length: 834
my_client_center_login_emailmy_client_center_passwordAdWords API PHP
Sample Codemy_client_center_login_email+
+USDmy_client_center_app_tokendgosdle45dsExactenHTTP/1.1 200 OK
Content-Type: text/xml; charset=iso-8859-1 Transfer-Encoding: chunked
Date: Sun, 02 Nov 2008 10:13:32 GMT X-Content-Type-Options: nosniff
Expires: Sun, 02 Nov 2008 10:13:32 GMT Cache-Control: private, max-
age=0 Server: GFE/1.3   94  1  1  6f0e8b7ce4780f3dfc79a56045bf7ad8

I'm not sure how to trouble shoot this.
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