使用php curl发布saml文件并将C#代码转换为php

我试图使用curl在php中为sso目的对saml文件进行httpost，但xml内容需要先编码为字节utf8，然后再编码为base64（这是我发布到的公司的要求），所以他们给了我这篇文章c，并告诉我将其转换为php 这是我到目前为止在php curl saml文章中得到的内容：

---

---

如果我的代码错了，请告诉我。

---

谢谢

它是否按预期运行？当前是否存在任何问题？到url的帖子正在工作，但正在正确验证。它会将我重定向到他们的注册页面抱歉，它没有正确验证

<?php
$url = "https://my.sandbox.company.com/sso/authenticate.ashx";
$filename = "saml.xml";
$handle = fopen($filename, "r");
$XPost = fread($handle, filesize($filename));
echo urlencode($XPost);
fclose($handle);

$decdata = urlencode($XPost);
$raw = base64_encode($decdata);


$ch = curl_init();

curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);


curl_setopt($ch, CURLOPT_VERBOSE, 1); 
curl_setopt($ch, CURLOPT_URL, $url); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
//curl_setopt($ch, CURLOPT_HTTPHEADER, Array("Content-Type: text/xml"));
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_TIMEOUT, 40); 
curl_setopt($ch, CURLOPT_POSTFIELDS, $raw);
curl_setopt($ch, CURLOPT_POST, 1);

$result = curl_exec($ch); // run the whole process
if (empty($result)) {
die(curl_error($ch));
curl_close($ch); // close cURL handler
} else {
$info = curl_getinfo($ch);
curl_close($ch); // close cURL handler
if (empty($info['http_code'])) {
die("No HTTP code was returned");
} 
else {
echo "The server responded: \n";
echo $info['http_code'] . " " . $http_codes[$info['http_code']];
}
}

echo "RESULT: $result"; //contains response from server

?>

string responseStr = doc.OuterXml;
byte[] base64EncodedBytes = Encoding.UTF8.GetBytes(responseStr);
string returnValue = System.Convert.ToBase64String(base64EncodedBytes);