sample trial download shortcode

gistfile1.txt

add_shortcode('trial_contents', 'do_trial_contents');
function do_trial_contents($atts='') {
    $content = '';
    
    if (trial_check_cookie()) {
        $content = trial_get_the_download_link();
    } else {
      
        if (!empty($_POST) && isset($_POST['action']) && $_POST['action'] == 'trial-signup'){
            
            //Do the mail chimp submission stuff here. 
            
            //Record the submission in WordPress somehwere. Maybe a custom post type to keep the Admin UI simple. 
        
            $content = trial_get_the_download_link();
            
        }
        
        else {
            
            $content = trial_get_signup_form();
            
        }
        
    }
    
    return $content;
    
}

function trial_check_cookie() {
    return isset($_COOKIE['trialcheck']);
}

function trial_get_signup_form() {
    return '<form><input type="hidden" name="action" value="trial-signup" /><input type="submit" value="Signup" /></form>';
}

function trial_get_the_download_link() {
    return '<a href="#">Download</a>';
}