How to Show all UPS pkg scan history in PHP?

I use below PHP code for UPS trakcing tools, but return only one scan activity not all history, somebody who can help advice how to revise the code to show all scan history for the pkg? Appreicated that!

<?php 
error_reporting(0); 
class upstraking 
{
function upstrack($trackingno,$account_data)
{
    $trackingno='1Z2404976771067421';
    $data ="<?xml version=\"1.0\"?>
    <AccessRequest xml:lang='en-US'>
    <AccessLicenseNumber>".$account_data['access_lic_no']."</AccessLicenseNumber>
    <UserId>".$account_data['username']."</UserId>
    <Password>".$account_data['password']."</Password>
    </AccessRequest>
    <?xml version=\"1.0\"?>
    <TrackRequest>
    <Request>
    <RequestOption>1</RequestOption>    #0 is last status   
    <TransactionReference>
    <CustomerContext>
    <InternalKey>blah</InternalKey>
    </CustomerContext>
    <XpciVersion>1.0</XpciVersion>
    </TransactionReference>
    <RequestAction>Track</RequestAction>
    </Request>
    <TrackingNumber>$trackingno</TrackingNumber>
    </TrackRequest>";
    $ch = curl_init("http://ift.tt/1j4eG9I");
    curl_setopt($ch, CURLOPT_HEADER, 1);
    curl_setopt($ch,CURLOPT_POST,1);
    curl_setopt($ch,CURLOPT_TIMEOUT, 60);
    curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
    curl_setopt ($ch, CURLOPT_SSL_VERIFYPEER, 0);
    curl_setopt ($ch, CURLOPT_SSL_VERIFYHOST, 0);
    curl_setopt($ch,CURLOPT_POSTFIELDS,$data);
    $result=curl_exec ($ch);
     //echo '<!-- '. $result. ' -->';
    $data = strstr($result, '<?');
    $xml_parser = xml_parser_create();
    xml_parse_into_struct($xml_parser, $data, $vals, $index);
    xml_parser_free($xml_parser);
    $params = array();
    $level = array();
    #print_r($vals);#die();
    foreach ($vals as $xml_elem) {
    if ($xml_elem['type'] == 'open') {
        if (array_key_exists('attributes',$xml_elem)) {
                list($level[$xml_elem['level']],$extra) = array_values($xml_elem['attributes']);
        } else {
                $level[$xml_elem['level']] = $xml_elem['tag'];
        }
    }
    if ($xml_elem['type'] == 'complete') {
        if(isset($xml_elem['value']) && $xml_elem['value'] != '') {
            $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);
        }

 }
 }
curl_close($ch);
//return $params;
print_r($params); // this array will return full information of tracking

//die();
$table = "";
$table .= "<table class='pure-table pure-table-horizontal' border='1'    height='100'>";
$table .= "<th>TRACKINGNUMBER</th>";
$table .= "<th>Date</th>";
$table .= "<th>Description</th>";
$table .= "<th>Address</th>";
//$table .= "<th>Signatory Name</th>";
//$table .= "<th>Event Type</th>";
$table .= "</tr>";

if($params['TRACKRESPONSE']['RESPONSE']['RESPONSESTATUSDESCRIPTION']=='Success')
{
$shipment=$params['TRACKRESPONSE']['SHIPMENT'];
$address_arr=$shipment['PACKAGE']['ACTIVITY']['ACTIVITYLOCATION']['ADDRESS'];
$address=$address_arr['CITY'].','.$address_arr['COUNTRYCODE'];

$table .= "<tr>";
$table .= "<td>".$shipment['PACKAGE']['TRACKINGNUMBER']."</td>";
$table .= "<td>".$shipment['PACKAGE']['ACTIVITY']['DATE'] . "</td>";
$table .= "<td>".$shipment['PACKAGE']['ACTIVITY']['STATUS']['STATUSTYPE']['DESCRIPTION'] . "</td>";
$table .= "<td>".$address."</td>";

$table .= "</tr>";

}
$table .= "</table>";

echo $table;
}
}


$obj_upstraking = new upstraking();
$account_data = array();
$account_data['access_lic_no']='UPSkey';
$account_data['username']='user';
$account_data['password']='pws';
$obj_upstraking->upstrack($trackingno='1Z2404976771067421',$account_data);?>