I have to manage some hierarchical data for my web application. The data consist of messages of four types. I decided to use nested-list model because there can be arbitrary number of child nodes in the data. The data that I need to store is coming from an external source, how do I add values to the 'lft' & 'rgt' fields for it to be inserted into mySQL.
EDITED This is how I display messages(timeline) that my application fetches from Twitter using curl.

foreach ($xml->entry as $status) {
       echo'<li>'.$status->content.'</li>';
   }

Şimdi doğrudan yazdırma rağmen, ben bu yani ebeveyn-çocuk hierachy yazdırabilirsiniz işleyebilirsiniz böylece veritabanına '$ status-> içerik' içeriğini saklamak gerekir.