override module

CP Module

<?php
/**
 * Implements hook_block().
 */
function cp_block($op = 'list', $delta = 0, $edit = array()) {
  if ($op == 'list') {
    $blocks = array();

    $blocks['theme_switcher'] = array(
      'info' => t('Theme Switcher'),
    );

    return $blocks;
  }
  elseif ($op == 'view') {
    switch($delta) {
      case 'theme_switcher':

       // Capture the cp variable
       $cp_theme = $_REQUEST['cp'];

       // If it is already set, remove it from
       // the destination link - else, add it
       if ($cp_theme == 'true') {
         $cp = '';
       }
       else {
         $cp = 'true';
       }

       // Allow drupal to render the link
       $link = l(t('Switch Theme'), $_REQUEST['q'], array('query' => array('cp' => $cp)));

        return array(
          'subject' => t('Theme Switcher'),
          'content' => theme('switcher_block', $link),
        );
        break;
    }
  }
}

/**
 * Implements hook_theme().
 */
function cp_theme($existing, $type, $theme, $path) {
  return array(
    'switcher_block' => array(
      'template' => 'switcher_block',
      'arguments' => array(
        'link' => NULL,   
      ),
    ),
  );
}

/**
 * Default implementation of theme_switcher_block().
 */
function theme_switcher_block() {
  return 'My themed block content';
}
?>

Override Module

<?php
/**
 * Implements hook_form_alter().
 */
function override_form_alter(&$form, $form_state, $form_id) {
  switch ($form_id) {
    case 'event_node_form':

      // Require the body
      $form['body_field']['body']['#required'] = TRUE;

      // Add in our own submit handler
      $form['#submit'][] = 'override_node_submit';
      break;
  }
}

/**
 * Custom submit handler
 */
function override_node_submit($form, &$form_state) {
  dpm('Submit handler function');
}

function override_form_event_node_form_alter(&$form, $form_state) {
}

/**
 * Implements hook_nodeapi().
 */
function override_nodeapi(&$node, $op, $a3 = NULL, $a4 = NULL) {

  switch ($op) {
    case 'load':
      foreach ($node as $key => $value) {
        if (preg_match('/^field_english_(.*)$/', $key, $matches)) {
          $node->translated[$matches[1]] = $value[0];
        }
      }
      break;
  }
      drupal_set_title($node->translated['title']['value']);
}

/**
 * Implements hook_menu().
 */
function override_menu() {
  $items = array();

  $items['override'] = array(
    'title' => 'My override page',
    'page callback' => 'override_pageview',
    'access arguments' => array('access override page'),
  );
  $items['override/settings'] = array(
    'title' => 'My override page',
    'page callback' => 'override_pageview',
    'access arguments' => array('access override page'),
    'type' => MENU_DEFAULT_LOCAL_TASK,
  );
  $items['override/options'] = array(
    'title' => 'My override page',
    'page callback' => 'override_pageview_options',
    'access arguments' => array('access override page'),
    'type' => MENU_LOCAL_TASK,
  );

  return $items;
}

/**
 * Implements hook_perm().
 */
function override_perm() {
  return array(
    'access override page',
  );
}

function override_pageview_options() {
  return 'my options page';
}

function override_pageview() {
  return 'my page';
}
?>

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