lepetitmessager

It’s working for me, thank you for your help. i did a little modification on you code. I removed the last “,” after PHD

‘Phd’ => ‘PHD’, –> ‘Phd’ => ‘PHD’

So the right code for me is :

// Add a categories to a post based on keywords in the title.
// Modify the $title_keywords array.  Use one keyword => one category name
// Categories MUST exist first.  The Post title keywords will match regardless of case.
function mam_add_category ($post_id = 0) {
   if (!$post_id) return;
   $title_keywords = array ( // The keywords and the corresponding category name to add
     'Germany' => 'Germany',
     'Phd' => 'PHD'
   );
   $title = get_the_title($post_id);
   foreach ( $title_keywords as $keyword => $cat ) {
      if ( stripos($title, $keyword) !== false ) {
         $cat_id = get_cat_ID($cat);
      }
      if ($cat_id) {
         $result =  wp_set_post_terms( $post_id, $tags = $cat_id, $taxonomy = 'category', $append = true );
      }
   }
}
add_action('publish_post','mam_add_category');

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Next step is create a page in the back office to add keywords in the backoffice. 🙂