Zend_Session: unserialize session data

I'm using session SaveHandler to persist session data in the database.

Sample sessio开发者_StackOverflow中文版n_data column from the database:

Messenger|a:1:{s:13:"page_messages";a:0:{}}userSession|a:1:{s:7:"referer";s:32:"http://cms.dev/user/profile/view";}Zend_Auth|a:1:{s:7:"storage";O:19:"User_Model_Identity":3:{s:2:"id";s:1:"1";s:8:"username";s:13:"administrator";s:4:"slug";s:13:"administrator";}}

I want to delete Zend_Auth object from this session data.

How can I unserialize those objects and remove object I need?

I suspect, that I don't have to write my custom parser, that Zend_Session already has a method to do this. I have tried different combinations of unserialize but it still returns false.

I'm using autoloader from ZF 1.10.2 and Doctrine 1.2

The code below will work, it is not mine, but in essence what it does is split the session string apart using the pipe as a delimiter, the unserialize the split chunks individually.

The problem is that the build in unserialize function in php doesn't understand the concatenated serialization.

function unserialize_session_data( $serialized_string ) {
   $variables = array();
   $a = preg_split("/(\w+)\|/", $serialized_string, -1, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);
   for($i=0;$i<count($a);$i=$i+2){
       $variables[$a[$i]] = unserialize($a[$i+1]);
   }
   return($variables);
}