WP ThirstyAffiliates插件挂钩

Question

I'm using ThirstyAffiliates plugin and I need to do some changes in function thirstyRedirectUrl(). The trouble is after update plugin my changes will disappear. How and where can I make some hook?

My change is

if (isset($_GET['token']) && $_GET['token'] != '')
  $redirectUrl = apply_filters('thirstyFilterRedirectUrlToken', $redirectUrl, $_GET['token']);
else
  $redirectUrl = apply_filters('thirstyFilterRedirectUrl', $redirectUrl);

Here is all code of the function

function thirstyRedirectUrl() {
global $post;

if (get_post_type($post) == 'thirstylink') {
    // Get link data and set the redirect url
    $linkData = unserialize(get_post_meta($post->ID, 'thirstyData', true));
    $thirstyOptions = get_option('thirstyOptions');

    // Set redirect URL
    $redirectUrl = htmlspecialchars_decode($linkData['linkurl'], ENT_COMPAT);

    // Set redirect type
    $redirectType = $linkData['linkredirecttype'];
    if (empty($redirectType))
        $redirectType = $thirstyOptions['linkredirecttype'];

    // Apply any filters to the url before redirecting
    if (isset($_GET['token']) && $_GET['token'] != '')
        $redirectUrl = apply_filters('thirstyFilterRedirectUrlToken', $redirectUrl, $_GET['token']);
    else
        $redirectUrl = apply_filters('thirstyFilterRedirectUrl', $redirectUrl);
    $redirectType = apply_filters('thirstyFilterRedirectType', $redirectType);

    // Perform any actions before redirecting
    do_action('thirstyBeforeLinkRedirect', $post->ID, $redirectUrl, $redirectType);

    if (empty($redirectType))
        $redirectType = 301; // default to 301 redirect

    // Redirect the page
    if (!empty($redirectUrl))
        wp_redirect($redirectUrl, intval($redirectType));
    exit();
}
}

Answer 1

I've had a look at the source code for the plugin. I don't think it needs to be changed. In fact, it can't be changed if you want to be able to upgrade it - you need to use the hooks the developers provide, and if they don't provide any you're out of luck. That goes for all plugins, not just this one.

Roll back your changes, then add something like the following to your theme (untested, but it should point you in the right direction):

function myThirstyFilterRedirectUrl($redirecturl) {
    $result = ''; // a filter action needs to return a value
    if (isset($_GET['token']) && $_GET['token'] != '') {
        // Do your token processing here, and set $result
    }
    else {
        // Do your non-token processing here, and set $result
    }
    return $result;
}

add_filter('thirstyFilterRedirectUrl', 'myThirstyFilterRedirectUrl');