Easily attach filters in WordPress, then remove them.

filter-proxy.php

<?php

// This is an PHP Trait http://php.net/manual/ro/language.oop5.traits.php

trait FilterProxy {

  protected $_filter_proxy_storage = [];
  
  public function _filter_proxy_setup( $information ) {
    if( empty( $information ) )
      return;

    if( !empty( $this->_filter_proxy_storage ) )
      $this->_filter_proxy_remove();

    $this->_filter_proxy_storage = $information;

    foreach( $this->_filter_proxy_storage as $filter_name => $filter_function )
      add_filter( $filter_name, [ $this, '_filter_proxy_callback' ], 20 );
  }
  
  public function _filter_proxy_remove() {
    if( empty( $this->_filter_proxy_storage ) )
      return;

    foreach( $this->_filter_proxy_storage as $filter_name => $filter_function )
      remove_filter( $filter_name, [ $this, '_filter_proxy_callback' ], 20 );

    $this->_filter_proxy_storage = [];
  }

  public function _filter_proxy_callback( $current_value ) {
    $current_filter = current_filter();

    if( !isset( $this->_filter_proxy_storage[$current_filter] ) )
      return $current_value;

    if( !is_callable( $this->_filter_proxy_storage[$current_filter] ) )
      return $this->_filter_proxy_storage[$current_filter];

    return call_user_func_array( $this->_filter_proxy_storage[$current_filter], func_get_args() );
  }

}

short-code-example.php

<?php

class Course {
  
  use FilterProxy;

  public function __construct() {
    add_shortcode( 'WPEP_index', [ $this, 'primary' ] );
  }

  public function primary($attributes, $content = null) {
    if( !is_user_logged_in() && in_array( 'index-page-shortcode', wpep_get_auth_status_page_restrictions() ) )
      return WPEP_Controller::instance()->shortCode->profile->authentication( $attributes );

    WPEP_Controller::instance()->templateStyle->match_request_layout_options( $attributes );

    $post_id             = isset($attributes['post_id'])         ? intval( $attributes['post_id'] )        : false;
    $include_header      = isset($attributes['include_header'])  ? intval( $attributes['include_header'] ) : false;
    $include_footer      = isset($attributes['include_footer'])  ? intval( $attributes['include_footer'] ) : false;

    $this->_filter_proxy_setup( $this->_primary_filters( $attributes ) );

    $response = WPEP_Controller::instance()->template->get_template(
      'primary.php', [
        'post_id'        => $post_id,
        'include_header' => $include_header,
        'include_footer' => $include_footer
      ]
    );

    $this->_filter_proxy_remove();

    return $response;
  }

  private function _primary_filters( $attributes ) {
    $filter_proxy_list = [];

    $category_ids         = isset($attributes['categories'])           ? $attributes['categories']  : '';
    $categories_per_row   = isset($attributes['categories_per_row'])   ? intval( $attributes['categories_per_row'] )  : '';
    $course_progress_bars = isset($attributes['course_progress_bars']) ? intval( $attributes['course_progress_bars'] )  : '';
    $courses_per_row      = isset($attributes['courses_per_row'])      ? intval( $attributes['courses_per_row'] )  : '';
    $videos_per_row       = isset($attributes['videos_per_row'])       ? intval( $attributes['videos_per_row'] )  : '';
    $ebooks_per_row       = isset($attributes['ebooks_per_row'])       ? intval( $attributes['ebooks_per_row'] )  : '';
    $offers_per_row       = isset($attributes['offers_per_row'])       ? intval( $attributes['offers_per_row'] )  : '';
    $category_navigation  = isset($attributes['category_navigation'])  ? intval( $attributes['category_navigation'] ) : '';
    $display_header       = isset($attributes['display_header'])       ? $attributes['display_header']  : null;
    $course_list_ids      = isset($attributes['courses'])              ? $attributes['courses'] : '';

    if( $category_ids !== '' )
      $filter_proxy_list['wpep_primary_content_category_list_args'] = function( $args ) use ( $category_ids ) {
        $args['include'] = $category_ids;

        return $args;
      };

    if( $categories_per_row != '' )
      $filter_proxy_list['wpep_template_category_list_items_per_row'] = function ($current_per_row) use ($categories_per_row) {
        return ($categories_per_row == 0 ? $current_per_row : $categories_per_row);
      };

    if( $course_progress_bars != '' )
      $filter_proxy_list['wpep_primary_content_grid_courses_progress_bars'] = function( $current_per_row ) use ( $course_progress_bars ) {
        return $course_progress_bars;
      };

    if( $courses_per_row !== '' )
      $filter_proxy_list['wpep_primary_content_grid_courses_per_row'] = function( $current_per_row ) use ( $courses_per_row ) {
        return $courses_per_row;
      };

    if( $course_list_ids !== '' )
      $filter_proxy_list['wpep_primary_content_course_list_args'] = function( $args ) use ( $course_list_ids ) {
        $args['include'] = $course_list_ids;

        return $args;
      };

    if( $videos_per_row !== '' )
      $filter_proxy_list['wpep_primary_content_grid_videos_per_row'] = function( $current_per_row ) use ( $videos_per_row ) {
        return $videos_per_row;
      };

    if( $ebooks_per_row !== '' )
      $filter_proxy_list['wpep_primary_content_grid_ebooks_per_row'] = function( $current_per_row ) use ( $ebooks_per_row ) {
        return $ebooks_per_row;
      };

    if( $offers_per_row !== '' )
      $filter_proxy_list['wpep_primary_content_grid_offers_per_row'] = function( $current_per_row ) use ( $offers_per_row ) {
        return $offers_per_row;
      };

    if( $category_navigation !== '' )
      $filter_proxy_list['wpep_primary_content_category_navigation_enabled'] = function( $current_category_navigation ) use ( $category_navigation ) {
        return $category_navigation;
      };

    if( $display_header !== null )
      $filter_proxy_list['wpep_primary_content_display_header'] = function( $internal_display_header ) use ( $display_header ) {
        return $display_header;
      };

    return $filter_proxy_list;
  }
  
}