Retain Original Referral URL? [RESOLVED]

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You can use a cookie holding the value of the http referrer. Set it only if the http_referrer does not contain your site URL anywhere on all pages.

PHP:

setcookie( 'my-referral-cookie', $_SERVER['HTTP_REFERER'], time() + 3600, COOKIEPATH, COOKIE_DOMAIN, false );

JavaScript code: (for setting and getting cookies in general)

function setCookie(name,value,days) {
    var expires = "";
    if (days) {
        var date = new Date();
        date.setTime(date.getTime() + (days*24*60*60*1000));
        expires = "; expires=" + date.toUTCString();
    }
    document.cookie = name + "=" + (value || "")  + expires + "; path=/";
}
function getCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for(var i=0;i < ca.length;i++) {
        var c = ca[i];
        while (c.charAt(0)==' ') c = c.substring(1,c.length);
        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
    }
    return null;
}
function eraseCookie(name) {   
    document.cookie = name +'=; Path=/; Expires=Thu, 01 Jan 1970 00:00:01 GMT;';
}

To read the cookie and pass it to a hidden field, check this post here:

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