Sending Custom Header with CURL - php

Question

I want to send a request to a web service via an API as shown below, i have to pass
a custom http header(Hash), i'm using CURL, my code seems to work but I'm not getting
the rigth response, I'm told it has to do with the hash value, though the value has
been seen to be correct, is there anything wrong with the way I'm passing it or with
the code itself.
<?php
$ttime=time();
$hash="123"."$ttime"."dfryhmn";
$hash=hash("sha512","$hash");
$curl = curl_init();
curl_setopt($curl,CURLOPT_HTTPHEADER,array('Hash:$hash'));
curl_setopt ($curl, CURLOPT_URL, 'http://web-service-api.com/getresult.xml?clientid=456&time=$ttime');
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
$xml = curl_exec ($curl);
if ($xml === false) {
die('Error fetching data: ' . curl_error($curl));
}
curl_close ($xml);
echo htmlspecialchars("$xml", ENT_QUOTES);
?>

Answer 1

If you need to get and set custom http headers in php, the following short tutorial is really useful:
Sending The Request Header
$uri = 'http://localhost/http.php';
$ch = curl_init($uri);
curl_setopt_array($ch, array(
CURLOPT_HTTPHEADER => array('X-User: admin', 'X-Authorization: 123456'),
CURLOPT_RETURNTRANSFER =>true,
CURLOPT_VERBOSE => 1
));
$out = curl_exec($ch);
curl_close($ch);
// echo response output
echo $out;
Reading the custom header
print_r(apache_request_headers());
you should see
Array
(
[Host] => localhost
[Accept] => */*
[X-User] => admin
[X-Authorization] => 123456
[Content-Length] => 9
[Content-Type] => application/x-www-form-urlencoded
)
Custom Headers with PHP CGI
in .htaccess
RewriteEngine On
RewriteRule .? - [E=User:%{HTTP:X-User}, E=Authorization:%{HTTP:X-Authorization}]
Reading the custom headers from $_SERVER
echo $_SERVER['User'];
echo $_SERVER['Authorization'];
Resources
http://www.omaroid.com/php-get-and-set-custom-http-headers/
How can I get PHP to display the headers it received from a browser?

Answer 2

'Hash:$hash' should be either "Hash: $hash" (double quotes) or 'Hash: '.$hash
The same goes for your URL passed in CURLOPT_URL