views_get_view(): SET filter/argument

views_get_view_set_filter_or_argument

<?php
function function_name(){
  // Load params.
  $query_parameters = drupal_get_query_parameters();

  // Load view.
  $view = views_get_view('views_id');
  $view->set_display('views_display_id');

  // Load all exposed filters.
  $filters = $view->display_handler->get_option('filters');

  // Validate and set filter.
  foreach ($filters as $k => $v) {
    // Set vars.
    $identifier = $v['expose']['identifier'];
    $value = $query_parameters[$identifier];

    // Define parameter.
    $filtered_parameters[$identifier] = $value;
  }

  // Set exposed filters.
  // http://www.grasmash.com/article/programmatically-render-drupal-view-exposed-filters-arguments-etc
  $view->exposed_input = array_merge($filtered_parameters, (array)$view->exposed_input);
  $view->exposed_raw_input = array_merge($filtered_parameters, (array)$view->exposed_raw_input);
  $view->exposed_data = array_merge($filtered_parameters, (array)$view->exposed_data);

  // Set arguments.
  $args = array($arg1, $arg2);
  $view->set_arguments($args);

  // change the amount of items to show
  $view->set_items_per_page(8);

  // Execute.
  $view->pre_execute();
  $view->execute();

  // Render.
  return drupal_json_output($view->render());
}