<?php
//custom.module: function custom_preprocess_node(&$vars) {
drupal_add_html_head(array(
'#tag' => 'meta',
'#attributes' => array(
'property' => 'og:description',
'content' => trim(strip_tags($vars['node']->body['und'][0]['safe_value'])),
),
), 'og_description');
?>在 node page 加入 open graph tags
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