drupal 7 - Need to change node's path to CCK value -

i have content type has been turned feature named "earth news". includes optional cck field called "source url". when cck field not blank want site visitor able click on teaser , go straight url.

i've added following preprocess function .module file feature:

function earth_news_preprocess_node(&$vars) {   $node = node_load($vars['nid']);   $path = drupal_lookup_path('alias','node/' . $node->nid);   $url = $node->field_se_news_source['und'][0]['url'];    path_save(array($path,$url)); } 

the path_save throwing fatal error:

only variables can passed reference 

am on right path? what's error about?

thanks.

the error caused fact path_save() expecting single argument passed reference. in such case, cannot use literal array; pass variable containing array, or value returned function returns reference, value expected argument needs associative array containing following keys:

• source: internal system path
• alias: url alias
• pid: (optional) unique path alias identifier
• language: (optional) language of alias

in case, code should following one.

function earth_news_preprocess_node(&$vars) {   $node = $vars['node'];   $path = array(     'alias' => drupal_lookup_path('alias','node/' . $node->nid),     // can use following line instead of previous one.     // 'alias' => drupal_get_path_alias('node/' . $node->nid),     'source' => $node->field_se_news_source['und'][0]['url'],   );    path_save($path); } 

as side note, template_preprocess_node() makes available node object $vars['node']; there no need load node.