Make Drupal 7 not to redirect to the node display after saving it

README.md

Drupal 7's default behavior is to redirect the user to the full display of a node after it has been saved.

If you want to stay in the edit form after saving, add this snippet to a custom module adjusting the module namespace in the two functions.

For Drupal 8 or 9, have a look at the comment below by @zanvidmar.

Acknowledgements

• msnbc
• Karen Stevenson

mymodule.php

/**
 * Implements hook_form_BASE_FORM_ID_alter().
 */
function mymodule_form_node_form_alter(&$form, &$form_state, $form_id) {
  $form['actions']['submit']['#submit'][] = '_mymodule_node_submit_redirect';
}

/**
 * Extra node form submit handler. Done this way to override the default.
 */
function _mymodule_node_submit_redirect($form, &$form_state) {
  if (isset($_GET['destination'])) {
    unset($_GET['destination']);
  }
  $form_state['redirect'] = 'node/' . $form_state['nid'] . '/edit/';
}

Thank you for the code snippet. I am not sure for which core version this applies. However since $form_state is an object, this code snippet should be updated to:

function _mymodule_node_submit_redirect($form, &$form_state) {
  if (isset($_GET['destination'])) {
    unset($_GET['destination']);
  }

  $url = \Drupal\Core\Url::fromRoute('entity.node.edit_form')
    ->setRouteParameters(['node'=> $form_state->getValue('nid')]);

  /** @var \Drupal\Core\Form\FormState $form_state  */
  $form_state->setRedirectUrl($url);
}

Thanks @zanvidmar! I updated the gist so it states the version and also referenced your comment for Drupal 8.