i'm developing a plugin wich uses GET parametters to decide what to render to the user(example: login, logout, change password etc..), the thing is this works in the standards wordpress themes but when i changed to my clients theme(Sereno) every time i call the url with the parametter it render a POST page... example

if a call http://localhost/myclient/?page_id=822&action=passresset in the standard wp theme it will show what i want but if a change to sereno shows a post page, its weird to my that does not show an 404 error, like this recognizes the URL like a valid one

I'm trying to fix this but i have no idea where to start, i guess the problem should be in the way the template decides what kind of loop it will use but i don't know where the **** its that script..

Pleace help!!


first than all, fuxia thanks a lot for taking time on helping me...

i'm using a widget to handle a type of users (not the same users of WP) which will have access to login, logout, change password, resset password and send requests via a form so my widget class is as follows

class SucursalWidget extends baseWidget {

public function __construct() {
    $widgetOptions = [
        'classname' => 'SucursalWidget',
        'description' => 'Panel de búsqueda para las sucursales',

    parent::__construct('sucursalwidget', "Widget para las sucursales", $widgetOptions);

public function login() {
  //process user login

public function logout() {
    echo "<h2>Su sesion ha sido terminada</h2>";
    $model = new LoginForm();
    $this->renderPartial('loginform', ['model' => $model]);

public function solicitud() {
  //Gets a form an save it on db

 * Cambiar contraseña para usuario ya logeado
public function passChange() {


 * Recuperar contraseña perdida vía email
public function passResset() {
   //PROCEESS pass resset

public function widget($args, $instance) {
    $action = isset($_GET['action']) ? $_GET['action'] : 'login';

    switch ($action) {
        case 'login': {
        case 'logout': {
        case 'solicite': {
        case 'passchange': {
        case 'passresset': {

        default: {
                echo "Página no encontrada";


as you can see in the function widget the switch uses the $_GET['action'] to know what to do with depending on the user's actions, this method works just fine when i use a regular WP theme like Twenty Fifteen. I guess the theme (named Sereno) its changing the URLs pattern because when i put any extra get parametter it shows a POST page i would expect an 404 error if something goes wrong, but for some reason is showing the last POST and i have no idea what to search for in the theme code..

2 Answers 2


WordPress is removing all unknown (not registered) $_GET parameters while processing the request (same is true for $_POST).

You can either register the custom variable, or just go the canonical PHP way by using filter_input(). This will access the original, unchanged GET parameters.

If you are using filter_input(), you have to hook into pre_get_posts to change the fetched resource.

You can also filter query_vars and register your custom variable here. This will make sure it is preserved.

add_filter( 'query_vars', function ( $vars ) {
    $vars[] = 'sereno';
    return $vars;

Then you can access it per get_query_var( 'sereno' ) now. You still have to change the request somehow if you want to show some custom content.

  • already tried that...the thing is my plugin is not working only with one specific template, i'll love to know where the templates decide what view file to use( i mean archive.php, single.php etc..) so i can see where the template is failling.. Apr 24, 2018 at 19:42
  • 1
    @IsanRodriguezTrimiño And here is the basic problem with your question: You left out the crucial part with your own code. :) Please update your question.
    – fuxia
    Apr 24, 2018 at 20:08
  • first than all, fuxia thanks a lot for taking time on helping me... Apr 25, 2018 at 12:55

I had found the problem, the thing is this template has taxonomy customizations, i commented

require_once('library/core/twomediax-wp-customizations.php'); // twomediax core custom types and taxonomies

this line is in the function.php, and without this customizations it works, now is giving me othe issues with template widget but i have a path to follow... now i have to struggle with taxonomies

fuxia thanks again for helping me

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