Sample code about how to pass data to GA

class.gaparse.php

<?
    class GA_Parse
    {
        var $campaign_source; // Campaign Source
        var $campaign_name; // Campaign Name
        var $campaign_medium; // Campaign Medium
        var $campaign_content; // Campaign Content
        var $campaign_term; // Campaign Term
        var $first_visit; // Date of first visit
        var $previous_visit; // Date of previous visit
        var $current_visit_started; // Current visit started at
        var $times_visited; // Times visited
        
        function __construct($_COOKIE) {
            $this->utmz = $_COOKIE["__utmz"];
            $this->utma = $_COOKIE["__utma"];
            $this->ParseCookies();
        }
        
        function ParseCookies(){
            // Parse __utmz cookie
            list($domain_hash,$timestamp, $session_number, $campaign_number, ↵
            $campaign_data) = split('[\.]', $this->utmz);
            // Parse the campaign data
            $campaign_data = parse_str(strtr($campaign_data, "|", "&amp;amp;"));
            $this->campaign_source = $utmcsr;
            $this->campaign_name = $utmccn;
            $this->campaign_medium = $utmcmd;
            $this->campaign_term = $utmctr;
            $this->campaign_content = $utmcct;
            
            if($utmgclid) {
                $this->campaign_source = "google";
                $this->campaign_name = "";
                $this->campaign_medium = "cpc";
                $this->campaign_content = "";
                $this->campaign_term = $utmctr;
            }
            // Parse the __utma Cookie
            list($domain_hash,
            $random_id,
            $time_initial_visit,
            $time_beginning_previous_visit,
            $time_beginning_current_visit,
            $session_counter) = split('[\.]', $this->utma);
            $this->first_visit = date("d M Y - H:i",$time_initial_visit);
            $this->previous_visit = date("d M Y - H:i",↵
            $time_beginning_previous_visit);
            $this->current_visit_started = date("d M Y - H:i",↵
            $time_beginning_current_visit);
            $this->times_visited = $session_counter;
        }
    } 
?>

passDataToGA.html

<script type="text/javascript">
    function _uGC(l,n,s) {
        // used to obtain a value form a string of key=value pairs
        if (!l || l=="" || !n || n=="" || !s || s=="") return "-";
    
        var i,i2,i3,c="-";
        i=l.indexOf(n);
        i3=n.indexOf("=")+1;
    
        if (i > -1) {
            i2=l.indexOf(s,i); if (i2 < 0) { i2=l.length; }
            c=l.substring((i+i3),i2);
        }
        return c;
    }
    
    function setHidden(f) {
        // set values for hidden form fields
        var z = _uGC(document.cookie, "utmz=",";");
        f.web_source.value = _uGC(z,"utmcsr=","|");
        f.web_medium.value = _uGC(z,"utmcmd=","|");
        f.web_term.value = _uGC(z,"utmctr=","|");
        f.web_content.value = _uGC(z,"utmcct=","|");
        f.web_campaign.value = _uGC(z,"utmccn=","|");
        var gclid = _uGC(z,"utmgclid=","|");
        
        if (gclid) { //this is an AdWords visitor
            f.web_source.value = "google";
            f.web_medium.value = "cpc";
            //It is not possible to capture AdWords campaign details by this
            //method as GA processing is required for this. Therefore the
            //following lines are set to remove confusion should a visitor
            //use multiple referrals with the last one being AdWords.
            f.web_term.value = ""; // remove previous info if any
            f.web_content.value = ""; // remove previous info if any
            f.web_campaign.value = ""; // remove previous info if any
        }
    }
</script>

<form method="post" action="formhandler.cgi" onSubmit="setHidden(this);">
    <input type=hidden name=web_source value="">
    <input type=hidden name=web_medium value="">
    <input type=hidden name=web_term value="">
    <input type=hidden name=web_content value="">
    <input type=hidden name=web_campaign value="">
</form>

passDataToGA.php

<?
    require("class.gaparse.php");
    $aux = new GA_Parse($_COOKIE);
    echo "Campaign source: ".$aux->campaign_source."<br />";
    echo "Campaign name: ".$aux->campaign_name."<br />";
    echo "Campaign medium: ".$aux->campaign_medium."<br />";
    echo "Campaign content: ".$aux->campaign_content."<br />";
    echo "Campaign term: ".$aux->campaign_term."<br />";
    echo "Date of first visit: ".$aux->first_visit."<br />";
    echo "Date of previous visit: ".$aux->previous_visit."<br />";
    echo "Date of current visit: ".$aux->current_visit_started."<br />";
    echo "Times visited: ".$aux->times_visited."<br />";
?>