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Can use set_title() for Drupal 7

function mymodule_preprocess_views_view(&$variables) {
  $view = $variables['view'];
  if ($view->name == 'machine_name' && $view->current_display == 'display_machine_name') {
    $view->set_title('New Display Title'); //added end quote
  }
}

You can use $view->set_title().

function mymodule_preprocess_views_view(&$variables) {
  $view = $variables['view'];
  if ($view->name == 'machine_name' && $view->current_display == 'display_machine_name') {
    $view->set_title('New Display Title');
  }
}

Can use set_title() for Drupal 7

function mymodule_preprocess_views_view(&$variables) {
  $view = $variables['view'];
  if ($view->name == 'machine_name' && $view->current_display == 'display_machine_name') {
    $view->set_title('New Display Title'); //added end quote
  }
}

Can use set_title() for Drupal 7

function mymodule_preprocess_views_view(&$variables) {
  $view = $variables['view'];
  if ($view->name == 'machine_name' && $view->current_display == 'display_machine_name') {
    $view->set_title('New Display Title'); //added end quote
  }
}

Can use set_title() for Drupal 7 function mymodule_preprocess_views_view(&$variables) { $view = $variables['view']; if ($view->name == 'machine_name' && $view->current_display == 'display_machine_name') { $view->set_title('New Display Title'); //added end quote } }

Can use set_title() for Drupal 7

function mymodule_preprocess_views_view(&$variables) {
  $view = $variables['view'];
  if ($view->name == 'machine_name' && $view->current_display == 'display_machine_name') {
    $view->set_title('New Display Title'); //added end quote
  }
}