Get redirect url and file get contents should match but they don't

Sorry about that subject line.. but it does relate what the question is about.

I have an ad serving platform that serves up ads on page load from an assortment of different ads that are eligible to appear depending upon the values I pass to it in the url.

I have circumstances that make it necessary for me to query the ad Server through php for a matched set of both the ad image and the intended click url of the ad.. and I'm pretty close to it, but right now what I get is an ad image and the click url of the PREVIOUS advertisement.. it doesn't seem to matter when I refresh the page.. the URL that I get is steadily one page refresh behind what the URL should be for the image that is showing.. Below is the code I'm running.. two files, image.php is referenced in index.php.

Anyone out there see anything in my logic that would cause such a delay?


------------------ image.php -----------------
<?php
$path = str_replace('..','',$_SERVER['QUERY_STRING']);
$fullpath = 'http://AdServerDomain.com/nserver/SITE=TEST/AREA=Front/pageid=$pageid';
header('Content-type:image/gif');
$data = file_get_contents($fullpath);
echo $data;
?>
----------------- image.php -----------------



----------------- index.php -----------------
<html>
<head>
</head>
<body>
<?
function generateRandomString($length = 15, $letters = '1234567890qwertyuiopasdfghjklzxcvbnm') 
 { 
 $s = ''; 
 $lettersLength = strlen($letters)-1; 
 for($i = 0 ; $i < $length ; $i++) 
 { 
 $s .= $letters[rand(0,$lettersLength)]; 
 } 
 return $s; 
 } 
 $pageid=generateRandomString();

function get_redirect_url($url){
$redirect_url = null; 
 
$url_parts = @parse_url($url);
if (!$url_parts) return false;
if (!isset($url_parts['host'])) return false; //can't process relative URLs
if (!isset($url_parts['path'])) $url_parts['path'] = '/';
 
$sock = fsockopen($url_parts['host'], (isset($url_parts['port']) ? (int)$url_parts['port'] : 80), $errno, $errstr, 30);
if (!$sock) return false;
 
$request = "HEAD " . $url_parts['path'] . (isset($url_parts['query']) ? '?'.$url_parts['query'] : '') . " HTTP/1.1\r\n"; 
$request .= 'Host: ' . $url_parts['host'] . "\r\n"; 
$request .= "Connection: Close\r\n\r\n"; 
fwrite($sock, $request);
$response = '';
while(!feof($sock)) $response .= fread($sock, 8192);
fclose($sock);
 
if (preg_match('/^Location: (.+?)$/m', $response, $matches)){
if ( substr($matches[1], 0, 1) == "/" )
return $url_parts['scheme'] . "://" . $url_parts['host'] . trim($matches[1]);
else
return trim($matches[1]);
 
} else {
return false;
}
}
?>

<img src="image.php?pageid=<? echo $pageid ;?>" />

<?
$clickUrl = get_redirect_url('http://AdServerDomain.com/ClickURL/SITE=TEST/AREA=Front/pageid=$pageid');
echo "$clickUrl";
?>


</body>
</html>
----------------- index.php -----------------

Get redirect url and file get contents should match but they don't

The_Hat

g1smd

The_Hat

The_Hat

Join The Conversation

Moderators and Top Contributors

Hot Threads This Week