Drupal 7 node creation programmatically

  $node = new stdClass();
  $node->title = "TITLE";
  $node->type = "NODE_TYPE";
  node_object_prepare($node); // Sets some defaults. Invokes hook_prepare() and hook_node_prepare().
  $node->language = LANGUAGE_NONE; // Or e.g. 'en' if locale is enabled
  $node->uid = $user->uid; 
  $node->status = 1; //(1 or 0): published or not
  $node->promote = 0; //(1 or 0): promoted to front page
  $node->comment = 1; // 0 = comments disabled, 1 = read only, 2 = read/write

  // Term reference (taxonomy) field
  $node->field_product_tid[$node->language][]['tid'] = $form_state['values']['a taxonomy term id'];

  // Entity reference field
  $node->field_customer_nid[$node->language][] = array(
    'target_id' => $form_state['values']['entity id'],
    'target_type' => 'node',
  );
  // 'node' is default,
  // Other possible values are "user" and  "taxonomy_term" 

  $node = node_submit($node); // Prepare node for saving
  node_save($node);