PHP - Whmcs Api Help

<?php 
 session_start(); 
 echo "ID: " . $_SESSION['clientID']; 
 $postfields = array(); 
 $postfields["action"] = "getclientsdetails"; 
 $postfields["clientid"] = $_SESSION['clientID']; 
 $postfields["stats"] = true; 
 $postfields["responsetype"] = "xml"; 
 echo "<br>"; 
 include('XMLAPI.php'); 
 ?>

<?php 
 /* *** WHMCS XML API Sample Code *** */ 
  
 $url = "http://inzernettechnologies.com/billing/includes/api.php"; # URL to WHMCS API file 
 $username = "user"; # Admin username goes here 
 $password = "pass"; # Admin password goes here 

 $postfields["username"] = $username; 
 $postfields["password"] = md5($password); 

 $query_string = ""; 
 foreach ($postfields AS $k=>$v) $query_string .= "$k=".urlencode($v)."&"; 
  
 $ch = curl_init(); 
 curl_setopt($ch, CURLOPT_URL, $url); 
 curl_setopt($ch, CURLOPT_POST, 1); 
 curl_setopt($ch, CURLOPT_TIMEOUT, 30); 
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
 curl_setopt($ch, CURLOPT_POSTFIELDS, $query_string); 
 curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0); 
 curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0); 
 $xml = curl_exec($ch); 
 if (curl_error($ch) || !$xml) $xml = '<whmcsapi><result>error</result>'. 
 '<message>Connection Error</message><curlerror>'. 
 curl_errno($ch).' - '.curl_error($ch).'</curlerror></whmcsapi>'; 
 curl_close($ch); 
  
 $arr = whmcsapi_xml_parser($xml); # Parse XML 
  
 print_r($arr); # Output XML Response as Array 
  
 /* 
 Debug Output - Uncomment if needed to troubleshoot problems 
 echo "<textarea rows=50 cols=100>Request: ".print_r($postfields,true); 
 echo "\nResponse: ".htmlentities($xml)."\n\nArray: ".print_r($arr,true); 
 echo "</textarea>"; 
 */ 
  
 function whmcsapi_xml_parser($rawxml) { 
     $xml_parser = xml_parser_create(); 
     xml_parse_into_struct($xml_parser, $rawxml, $vals, $index); 
     xml_parser_free($xml_parser); 
     $params = array(); 
     $level = array(); 
     $alreadyused = array(); 
     $x=0; 
     foreach ($vals as $xml_elem) { 
       if ($xml_elem['type'] == 'open') { 
          if (in_array($xml_elem['tag'],$alreadyused)) { 
              $x++; 
              $xml_elem['tag'] = $xml_elem['tag'].$x; 
          } 
          $level[$xml_elem['level']] = $xml_elem['tag']; 
          $alreadyused[] = $xml_elem['tag']; 
       } 
       if ($xml_elem['type'] == 'complete') { 
        $start_level = 1; 
        $php_stmt = '$params'; 
        while($start_level < $xml_elem['level']) { 
          $php_stmt .= '[$level['.$start_level.']]'; 
          $start_level++; 
        } 
        $php_stmt .= '[$xml_elem[\'tag\']] = $xml_elem[\'value\'];'; 
        @eval($php_stmt); 
       } 
     } 
       return($params); 
 } 
  
 ?>

ID: 1
Array ( [WHMCSAPI] => Array ( [ACTION] => getclientsdetails [RESULT] => success [CLIENT] => Array ( [USERID] => 1 [ID] => 1 [FIRSTNAME] => Cody [LASTNAME] => Robinson [FULLNAME] => Cody Robinson [COMPANYNAME] => InZernet Technologies [EMAIL] => cody-admin@inzernettechnologies.com [ADDRESS1] => Address [ADDRESS2] => [CITY] => 11 [FULLSTATE] => Michigan [STATE] => Michigan [POSTCODE] => 11111 [COUNTRYCODE] => US [COUNTRY] => US [STATECODE] => MI [COUNTRYNAME] => United States [PHONECC] => 1 [PHONENUMBER] => 1111111111 [PHONENUMBERFORMATTED] => 11111111 [BILLINGCID] => 0 [NOTES] => [PASSWORD] => PASSWORD [TWOFAENABLED] => [CURRENCY] => 1 [DEFAULTGATEWAY] => [CCTYPE] => [CCLASTFOUR] => [SECURITYQID] => 29 [SECURITYQANS] => Rogers [GROUPID] => 0 [STATUS] => Active [CREDIT] => 0.00 [TAXEXEMPT] => [LATEFEEOVERIDE] => [OVERIDEDUENOTICES] => [SEPARATEINVOICES] => [DISABLEAUTOCC] => [EMAILOPTOUT] => 0 [OVERRIDEAUTOCLOSE] => 0 [LANGUAGE] => [LASTLOGIN] => Date: 07/10/2014 17:43
IP Address: xx.xx.xx.xx.xx
Host: xx.xx.xx.xx.xx.xx.xx [CUSTOMFIELDS1] => Other [CUSTOMFIELDS] => Array ( [ID] => 1 [VALUE] => Other ) [CURRENCY_CODE] => USD ) [STATS] => Array ( [NUMDUEINVOICES] => 0 [DUEINVOICESBALANCE] => $0.00 USD [INCOME] => $0.00 USD [INCREDIT] => [CREDITBALANCE] => $0.00 USD [NUMOVERDUEINVOICES] => 0 [OVERDUEINVOICESBALANCE] => $0.00 USD [NUMPAIDINVOICES] => 0 [PAIDINVOICESAMOUNT] => $0.00 USD [NUMUNPAIDINVOICES] => 0 [UNPAIDINVOICESAMOUNT] => $0.00 USD [NUMCANCELLEDINVOICES] => 0 [CANCELLEDINVOICESAMOUNT] => $0.00 USD [NUMREFUNDEDINVOICES] => 0 [REFUNDEDINVOICESAMOUNT] => $0.00 USD [NUMCOLLECTIONSINVOICES] => 0 [COLLECTIONSINVOICESAMOUNT] => $0.00 USD [PRODUCTSNUMACTIVEHOSTING] => 0 [PRODUCTSNUMHOSTING] => 0 [PRODUCTSNUMACTIVERESELLER] => 0 [PRODUCTSNUMRESELLER] => 0 [PRODUCTSNUMACTIVESERVERS] => 0 [PRODUCTSNUMSERVERS] => 0 [PRODUCTSNUMACTIVEOTHER] => 0 [PRODUCTSNUMOTHER] => 0 [PRODUCTSNUMACTIVE] => 0 [PRODUCTSNUMTOTAL] => 0 [NUMACTIVEDOMAINS] => 0 [NUMDOMAINS] => 0 [NUMACCEPTEDQUOTES] => 0 [NUMQUOTES] => 0 [NUMTICKETS] => 0 [NUMACTIVETICKETS] => 0 [NUMAFFILIATESIGNUPS] => 0 ) ) )