require_once spits out header, help!

[leejayd]

I have the function below.  It works okay, except that a bunch of http header info is returned to the browser.    The cause of this is the require_once('HMAC.php'); statement at the top of the function.  Is there a way to stop this from happening?

 

<?php
require_once('HMAC.php'); 

function getS3Redirect($bucketName, $objectName) 
{ 
$accessKey = "1S1"; 
$secretKey = "adfa"; 
$S3_URL = "http://" . $bucketName . ".s3.amazonaws.com"; 
$expires = time() + (60*5); 
$stringToSign = "GET\n\n\n" . $expires . "\n/" . $bucketName . $objectName; 
$hasher =& new Crypt_HMAC($secretKey, "sha1"); 
$sig = $hasher->hash(trim($stringToSign)); 
$sig = hex2b64($sig); 
$sig = rawurlencode(trim($sig)); 

$signedurl = "$S3_URL$objectName?AWSAccessKeyId=$accessKey&Expires=$expires&Signature=$sig";
$hrefString ="<a href= \"$signedurl\">$signedurl </a>";

echo $hrefString;


} 
// 
// 
function hex2b64($str) 
{ 
$raw = ''; 
for ($i=0; $i < strlen($str); $i+=2) 
{ 
$raw .= chr(hexdec(substr($str, $i, 2))); 
} 
return base64_encode($raw); 
} 
?>

 

Thanks in advance

[Chris92]

All the header info has to be set before any HTML is loaded, if your HMAC.php page has any HTML on it before any headers are set it is going to cause an error.