Entity metadata wrappers

Entity metadata wrappers.php

<?php
// Create wrapper around the node.
$wrapper = entity_metadata_wrapper('node', $node);
// We can do it also using only $nid.
$wrapper = entity_metadata_wrapper('node', $nid);

// Get the value of field_name of the nodes author's profile.
$wrapper->author->profile->field_name->value();
$wrapper->author->profile->field_name->set('New name');

// Value of the node's summary in german language.
$wrapper->language('de')->body->summary->value();

// Check whether we can edit node's author email address.
$wrapper->author->mail->access('edit') ? TRUE : FALSE;

// Get roles of node's author.
$wrapper->author->roles->optionsList();

// Set description of the node's first file in field field_files.
$wrapper->field_files[0]->description = 'The first file';
$wrapper->save();

// Get node object.
$node = $wrapper->value();
?>