Specify Credentials in XMLReader - php

Question

I am attempting to access an XML feed (with username and password) by using XMLReader.
Formerly, I had integrated the credentials into the url (e.g. http://username:password#mysite.com); however, this is not working now.
I get 'XPath query failed for bio' at the final check in my code.
Would it be possible to specify the username/password in XMLReader?
Thanks for any leads.
My code (edited to include my Curl code):
<?php
$secondary_user_id = "jsmith";
$url_bio = "http://username:password#mysite.com";
//
$a_username='username';
$a_password='password';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url_bio);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_USERPWD, $a_username . ':' . $a_password);
$result = curl_exec($ch);
$a_error = curl_error($ch);
echo '<br>'.$a_error.'<br>';
curl_close($ch);
//
$reader = new XMLReader();
//$reader->open($url_bio);
$reader->XML($result);
while ($reader->read())
{
if ($reader->nodeType == XMLReader::ELEMENT && $reader->name == 'Users')
{
//the code works to this point
echo 'success<br>';
$node = $reader->expand();
$doc = new DOMDocument('1.0','UTF-8');//
$n = $doc->importNode($node,true);
$doc->appendChild($n);
//$xml_bio_report = simplexml_import_dom($doc->importNode($reader->expand(),true));//
$xml_bio_report = simplexml_import_dom($n);//
$xml_bio_report->registerXPathNamespace('xlink','http://www.w3.org/1999/xlink');
$xml_bio_report->registerXPathNamespace('dmu','http://www.digitalmeasures.com/schema/user-metadata');
//echo $xml_bio_report->Users->User;
$xml_bio_report_abbrev = $xml_bio_report->xpath('//User[#SecondaryID="'.$secondary_user_id.'"]');
if ($xml_bio_report_abbrev){
echo '<h1>'.$xml_bio_report_abbrev[0]['username'].'</h1>';
echo '<h1>'.$xml_bio_report_abbrev[0]['SecondaryID'].'</h1>';
} else {
echo 'XPath query failed for bio';
}
}
}
?>

Answer 1

XMLReader::open() uses the PHP streamwrapper. Here is a function called libxml_set_streams_context() that allows to set the context for the next open/load call.
$opts = array(
'http' => array(
'user_agent' => 'PHP libxml agent',
)
);
$context = stream_context_create($opts);
libxml_set_streams_context($context);
$reader = new XMLReader();
$reader->open($url_bio);
//...