load all referenced node from node reference field.

load-all-referenced-node-from-node-reference-field.php

<?php
// Get all referenced node from a node reference field.
function get_related_nodes($master_nid, $field_name) {
  // Load the 'master' node
  $master_node = node_load($master_nid);

  // Get the node reference items attached to this node
  $items = field_get_items('node', $node, $field_name);

  // Loop through and grab the nids
  $nids = array();
  foreach ($items as $item) {
    $nids[] = $item['nid'];
  }

  // Return the fully loaded reference nodes
  return node_load_multiple($nids);
}

// https://www.drupal.org/node/2321535
// Using entity metadata wrapper.
function custom_entity_load($id) {
  $my_entity = reset(entity_load('my_custom_entiy_with_er_field', array($id)));
  $wrapper = entity_metadata_wrapper('my_custom_entiy_with_er_field', $my_entity);
  $my_entity->children = $wrapper->my_entity_reference_field->value();

  return $my_entity;
}
// The original ER field data is still there at 
// $my_entity->field_my_entity_reference_field but there's now also an array of 
// the entities specified in the field with their complete properties at /
// $my_entity->children. The child entity isn't fieldable so that works for me.
// Not sure if it would include all the fields as well for entities 
// that do have them.