Adwords api data access

Hello everyone, i come to you because i'm quite desperate ^^. I have two big problems with the api. I'm using php and i can only get the campaigns...

1) Can someone help me access the groups and the keywords ?

2) I don't know how to use the sandbox.

I thank you in advance for your help.

Here is my code for the campaigns, i hope somebody will help me.

<?php

error_reporting(E_STRICT | E_ALL);

// You can set the include path to src directory or reference
// AdWordsUser.php directly via require_once.
// $path = '/path/to/aw_api_php_lib/src';
$path = dirname(__FILE__) . '/../../src';
set_include_path(get_include_path() . PATH_SEPARATOR . $path);

require_once 'Google/Api/Ads/AdWords/Lib/AdWordsUser.php';

try {
// Get AdWordsUser from credentials in "../auth.ini"
// relative to the AdWordsUser.php file's directory.
$user = new AdWordsUser();

// Log SOAP XML request and response.
$user->LogDefaults();

// Get the CampaignService.
$campaignService = $user->GetCampaignService();

// Get all campaigns.
$campaignPage = $campaignService->get(new CampaignSelector());

// Display campaigns.
if (isset($campaignPage->entries))
{
foreach ($campaignPage->entries as $campaign)
{
print 'Campaign with name "' . $campaign->name . '" and id
"'
. $campaign->id . "\" was found.<br/>";

}
}
else
{
print "No campaigns found.\n";
}

} catch (Exception $e) {
print_r($e);
}

?> 

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