Most SEO tutorials claim that meta keywords are not very important to search engines. But, if you insist on inserting meta keywords for each node's taxonomy terms, this tutorial will show you how to accomplish this. I added the following function to my template.php file in my theme.
<?php
function _phptemplate_variables($hook, $vars) {
// check for page scope
if ($hook == 'page') {
// ensure this page is a node view
if (is_object($vars['node'])) {
// get a list of taxonomy terms for this node
$terms = taxonomy_node_get_terms($vars['node']->nid);
// ensure terms exist
if (is_array($terms)) {
// loop through terms, and collect the names
$t = array();
foreach ($terms as $k => $v) {
$t[] = $v->name;
}
// ensure names exist
if (is_array($t)) {
// implode the terms into a string and add to the head variable
$vars['head'] .= "<meta name='keywords' content='" . implode(",", $t) . "'>";
}
}
}
}
return $vars;
}
?>To verify this code is working, check out the tags I used on this page and then view the source. Hopefully, they match!
(NOTE: my homepage is a view, so there show not be any meta keywords.)
NOTE: when I upgraded my theme to Drupal 6, I had to update this above code:
<?php
function MYTHEME_preprocess_page(&$variables) {
if (is_object($variables['node']) && is_array($variables['node']->taxonomy)) {
$tags = array();
foreach ($variables['node']->taxonomy as $tid => $term) {
if (!in_array($term->name, $tags)) $tags[] = $term->name;
}
if (count($tags)) {
sort($tags);
$variables['head'] .= "<meta name='keywords' content='" . implode(",", $tags) . "'>";
}
}
}
?>
Interesting concept! Thanks
Interesting concept! Thanks for pointing out the $node->taxonomy array -- I have now installed the development module which helps unveiling some of this. Learned something new today.
--Stephan Planken
I think nodewords does this also, right?
I haven't tried this feature of nodewords but I think I remember it is supposed to do this.
maybe...?
Last time I checked, this module creates an additional form element on the node edit screen that allows you to enter your own meta keywords. I wrote this code to automatically use the node's taxonomy terms, so I would not have to manage 2 sets of keywords.