Is there a plugin to record querystring parameters for a page (for customer tracking)?

I am creating an information landing page that I intend to cold email out to a bunch of potential clients. I need to track customers that not only open the email (I know how to do that) but track which email recipients actually navigated to the landing page.

In a custom web application I would do this by sending them a link to the landing page that’s something like www.site.com/landing?rec=my@email.com, and upon seeing the querystring I would put that in the database.

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Are there any WordPress plugins to do something like that?

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  1. WP is not really interested in what you add to the url string. But you could extract the url with native php functions and add your parts to the global wp_query; object using add_query_arg(). Then you can receive it via get_query_var() anywhere you need it.

    You could also use a hook to do the adding-job:

    function wpse42947_add_query_vars( $vars )
    {
        $vars[] = "WHATEVER";
        return $vars ;
    }
    // hook add_query_vars function into query_vars
    add_filter( 'query_vars', 'wpse42947_add_query_vars' );