USPS API 返回 80040B19 错误代码并且帐户处于生产状态

所以我的问题是根据文档（这非常薄，而且不是最好的），我拥有的 xml 是所需的一切，但我得到了这个错误代码

<?xml version="1.0" encoding="UTF-8"?>
<Error><Number>80040B19</Number><Description>XML Syntax Error: Please check the XML request to see if it can be parsed.</Description><Source>USPSCOM::DoAuth</Source></Error>

这对我来说没有多大意义，因为我的帐户处于生产模式，正如我所说，根据文档，我拥有所需的一切，我花了过去 2 天的时间试图让它工作，但什么也没有。

verifyAddress 函数工作正常，但 RateCheck 函数不起作用。

class USPS
    {
        protected $Endpoint = 'http://production.shippingapis.com/ShippingAPI.dll';
        protected $SecureEndpoint = 'https://secure.shippingapis.com/ShippingAPI.dll';
        protected $TestEndpoint = 'http://stg-production.shippingapis.com/ShippingAPI.dll';
        protected $TestSecureEndpoint = 'https://stg-secure.shippingapis.com/ShippingAPI.dll';
        private $username = 'example’;

        function VerifyAddress($address1, $address2, $city, $state, $zip)
        {
            $xml = '<AddressValidateRequest%20USERID="'.$this->username.'">
                <Address>
                <Address1>'.$address1.'</Address1>
                <Address2>'.$address2.'</Address2>
                <City>'.$city.'</City>
                <State>'.$state.'</State>
                <Zip5>'.$zip.'</Zip5>
                <Zip4></Zip4>
                </Address>
                </AddressValidateRequest>';
        //build the data
            $data = $this->AddressVerify . $xml;

        //send for the request
             $verified = $this->Request($data);
        //return he results
            return $verified;
        }

        function RateCheck($packages, $zipDest, $service='PRIORITY', $zipOrigin='93274', $pounds='3', $ounces='0',
                           $container='RECTANGULAR', $size='LARGE', $width='13', $length='14', $height='6', $girth='38')
        {
            $packageIDS = array('1ST'=>1, '2ND'=>2, '3RD'=>3, '4TH'=>4, '5TH'=>5, '6TH'=>6, '7TH'=>7, '8th'=>8,'9TH'=>9,
                '10th'=>10);

            $packagexml = array();

            for($i=1;$i<=$packages;$i++)
            {
                $PackageID = array_search($i, $packageIDS);
                $packagexml[] = '<Package ID="'.$PackageID.'">
                    <Service>'.$service.'</Service>
                    <ZipOrigination>'.$zipOrigin.'</ZipOrigination>
                    <ZipDestination>'.$zipDest.'</ZipDestination>
                    <Pounds>'.$pounds.'/Pounds>
                    <Ounces>'.$ounces.'</Ounces>
                    <Container>'.$container.'</Container>
                    <Size>'.$size.'</Size>
                    <Width>'.$width.'</Width>
                    <Length>'.$length.'</Length>
                    <Height>'.$height.'</Height>
                    <Girth>'.$girth.'</Girth>
                </Package>';
            }
            $xml2 = '';

            foreach($packagexml as $package)
            {
                $xml2 .= $package;
            }

            $data = 'API=RateV4&XML=<RateV4Request USERID="'.$this->username.'"><Revision>2</Revision>'.$xml2.'</RateV4Request>';


            $RateResult = $this->Request($data);
            return $RateResult;
        }
        function Request($data)
        {
            $ch = curl_init();

    // set the target url
            curl_setopt($ch, CURLOPT_URL,$this->Endpoint);
            curl_setopt($ch, CURLOPT_HEADER, 1);
            curl_setopt($ch,CURLOPT_RETURNTRANSFER,1);
            //curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);

    // parameters to post
            curl_setopt($ch, CURLOPT_POST, 1);
    // send the POST values to usps
            curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
            //curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
            $result=curl_exec ($ch);

            curl_close($ch);
            $Parseresult = $this->parseResult($result);
            return $Parseresult;
        }

        function parseResult($responce)
        {
            $data = strstr($responce, '<?');
     echo '<!-- '. $data. ' -->'; // Uncomment to show XML in comments
            $xml_parser = xml_parser_create();
            xml_parse_into_struct($xml_parser, $data, $vals, $index);
            xml_parser_free($xml_parser);
            $params = array();
            $level = array();
            foreach ($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') {
                    $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;
        }
    }

我收到此消息的原因是因为我在发布到 USPS API 的 XML 中包含未转义的 & 符号。在发布 XML 之前，请在屏幕上打印 XML，以便准确查看发布的内容。我不知道如何在 php 中执行此操作（也许是 echo？），但在 python 中我会这样做print(my_xml_string).

就像我说的，我生成的 xml 中有 & 符号&，我通过将其替换为来解决了问题&。再说一次，我对 php 不太熟悉，但 python 会my_xml_string.replace('&', '&')。这是因为 XML 中的 & 符号需要用;.