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Zend_Session_SaveHandler_DbTable - Zend_Session
The basic setup for Zend_Session_SaveHandler_DbTable must at least have four columns, denoted in the config array or Zend_Config object: primary, which is the primary key and defaults to just the session id which by default is a string of length 32; modified, which is the unix timestamp of the last modified date; lifetime, which is the lifetime of the session (modified + lifetime > time();); and data, which is the serialized data stored in the session
Example #1 Basic Setup
You can also use Multiple Columns in your primary key for Zend_Session_SaveHandler_DbTable.
Example #2 Using a Multi-Column Primary Key