greystripe_ads.php

<?php
 
function gs_adreq($adreq) {
 
  // Required variable checking
  if(! array_key_exists('site_id', $adreq) || 
     ! array_key_exists('HTTP_USER_AGENT', $_SERVER)) {
    return 'no site id or user agent';
  }
 
  // Configuration
  $url = 'http://adsx.greystripe.com/openx/www/delivery/mw2.php';
 
  $timeout = array_key_exists('timeout', $adreq) ? $adreq['timeout'] : 5;
  unset($adreq['timeout']);
 
  // request parameters
  $adreq['language'] = 'php';
  $adreq['version'] = '1.0';
  $adreq['format'] = 'html';
 
  if (! array_key_exists('ad_id', $adreq)) {
    $adreq['ad_id'] = rand(1000,9999);
  }
 
  $params = implode_with_keys('&', '=', $adreq);
  
  // phone headers
  $ignoredHeaders = array('HTTP_PRAGMA', 'HTTP_CACHE_CONTROL', 'HTTP_CONNECTION', 
                          'HTTP_COOKIE', 'HTTP_ACCEPT');
  $phoneHeaders = array();
  foreach ($_SERVER as $k => $v) {
    if (! in_array($k, $ignoredHeaders)) {
      $phoneHeaders[$k] = $v;
    }
  }
  
  if (count($phoneHeaders) > 0) {
    $params .= '&phone_headers=' . urlencode(implode_with_keys('||', '=>', $phoneHeaders));
  }
 
  // request ad
  $request = curl_init();
  curl_setopt($request, CURLOPT_URL, $url);
  curl_setopt($request, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);
  curl_setopt($request, CURLOPT_HEADER, 1);
  curl_setopt($request, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($request, CURLOPT_TIMEOUT, $timeout);
  curl_setopt($request, CURLOPT_CONNECTTIMEOUT, $timeout);
  curl_setopt($request, CURLOPT_HTTPHEADER, 
              array('Content-Type: application/x-www-form-urlencoded', 'Connection: Close'));
  curl_setopt($request, CURLOPT_POSTFIELDS, $params);
  $ad_contents = curl_exec($request);
  $header_size =  curl_getinfo($request, CURLINFO_HEADER_SIZE);
  
  $header = substr($ad_contents, 0, $header_size);
  $html = substr($ad_contents, $header_size, strlen($ad_contents));
  
  if (preg_match('/Greystripe-ErrorCode:\s*(.*)/i', $header, $matches)) {
    $greystripe_error_code = trim($matches[1]);
  }
  
  if (preg_match('/Greystripe-ErrorReason:\s*(.*)/i', $header, $matches)) {
    $greystripe_error_reason = trim($matches[1]);
  }
  
  if(!empty($greystripe_error_code) && !empty($greystripe_error_reason)) {
    $errMsg = '';
    
    /*
     * COMMENT OUT FOR ERROR MSGS!!
     *
     $errMsg .=  '\n<!--\n';
     $errMsg .=  'Greystripe Error Code: ' . $greystripe_error_code . '\n';
     $errMsg .=  'Greystripe Error Reason: '. $greystripe_error_reason . '\n';
     $errMsg .=  '\n-->\n';
    */
    return $errMsg;
  }
  
  $code = curl_getinfo($request, CURLINFO_HTTP_CODE);
  curl_close($request);
  
  if($code != 200) {
    return '';
  }
  
  return trim($html);
}
 
function implode_with_keys($glue, $subglue, $array) {
  $ret = array();
 
  foreach($array as $key => $value) {
    if (is_array($value)) {
      $value = implode(',', $value);
    }
    $ret[] = urlencode($key).$subglue.urlencode($value);
  }
 
  return implode($glue, $ret);
}
 
?>