Adsense for Mobile

im trying to setup an adsense revenue sharing site for mobile I know the javascript version is modified pretty easily...
anyone care to look at this and tell me how i can insert a random publishers id?

<?php
$publishid = "pub-12333333333";

$GLOBALS['google']['ad_type']='text_image';
$GLOBALS['google']['channel']='';
$GLOBALS['google']['client']='$publishid';
$GLOBALS['google']['format']='mobile_single';
$GLOBALS['google']['https']=$_SERVER['HTTPS'];
$GLOBALS['google']['host']=$_SERVER['HTTP_HOST'];
$GLOBALS['google']['ip']=$_SERVER['REMOTE_ADDR'];
$GLOBALS['google']['markup']='xhtml';
$GLOBALS['google']['oe']='utf8';
$GLOBALS['google']['output']='xhtml';
$GLOBALS['google']['ref']=$_SERVER['HTTP_REFERER'];
$GLOBALS['google']['url']=$_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
$GLOBALS['google']['useragent']=$_SERVER['HTTP_USER_AGENT'];
$google_dt = time();
google_set_screen_res();

function google_append_url(&$url, $param, $value) {
  $url .= '&' . $param . '=' . urlencode($value);
}

function google_append_globals(&$url, $param) {
  google_append_url($url, $param, $GLOBALS['google'][$param]);
}

function google_append_color(&$url, $param) {
  global $google_dt;
  $color_array = split(',', $GLOBALS['google'][$param]);
  google_append_url($url, $param,
                    $color_array[$google_dt % sizeof($color_array)]);
}

function google_set_screen_res() {
  $screen_res = $_SERVER['HTTP_UA_PIXELS'];
  $delimiter = 'x';
  if ($screen_res == '') {
    $screen_res = $_SERVER['HTTP_X_UP_DEVCAP_SCREENPIXELS'];
    $delimiter = ',';
  }
  $res_array = explode($delimiter, $screen_res);
  if (sizeof($res_array) == 2) {
    $GLOBALS['google']['u_w'] = $res_array[0];
    $GLOBALS['google']['u_h'] = $res_array[1];
  }
}

function google_get_ad_url() {
  $google_ad_url = 'http://pagead2.googlesyndication.com/pagead/ads?';
  $google_scheme = ($GLOBALS['google']['https'] == 'on')
      ? 'https://' : 'http://';
  foreach ($GLOBALS['google'] as $param => $value) {
    if ($param == 'client') {
      google_append_url($google_ad_url, $param,
                        'ca-mb-' . $GLOBALS['google'][$param]);
    } else if (strpos($param, 'color_') === 0) {
      google_append_color($google_ad_url, $param);
    } else if ((strpos($param, 'host') === 0)
               || (strpos($param, 'url') === 0)) {
      google_append_url($google_ad_url, $param,
                        $google_scheme . $GLOBALS['google'][$param]);
    } else {
      google_append_globals($google_ad_url, $param);
    }
  }
  google_append_url($google_ad_url, 'dt',
   		    round(1000 * array_sum(explode(' ', microtime()))));
  return $google_ad_url;
}

$google_ad_handle = @fopen(google_get_ad_url(), 'r');
if ($google_ad_handle) {
  while (!feof($google_ad_handle)) {
    echo fread($google_ad_handle, 8192);
  }
  fclose($google_ad_handle);
}

?>

PHP:

 

If you have predefined publisherid's, you could try to replace this line:

$publishid = "pub-12333333333";

Code (markup):

with this block of code:

$randpublishid[1] = 'pub-12333333334';
$randpublishid[2] = 'pub-12333333335';
$randpublishid[3] = 'pub-12333333336';

//....//....//Change 3 to as many links you have added above

$randid = rand(1,3);
$publishid = $randpublishid[$randid];

Code (markup):