Symfony2 Session management

config_with_memcache_sesssion.yml

# app/config.yml

framework:
    ...
    session:
        handler_id:     %session_handler_id%   # read from parameters.yml
        #handler_id: session.handler.memcache  # use service defined later 
        
services:
    # MEMCACHE SESSION MANAGEMENT SERVICE CONFIGURATION
    session.memcache:
        class: Memcache
        arguments:
            persistent_id: %session_memcache_prefix%
        calls:
            - [ addServer, [ %session_memcache_host%, %session_memcache_port% ]]
        session.handler.memcache:
            class:     Symfony\Component\HttpFoundation\Session\Storage\Handler\MemcacheSessionHandler
            arguments: [@session.memcache, { prefix: %session_memcache_prefix%, expiretime: %session_memcache_expire% }]
        

config_with_pdo_session_management.yml

# app/config.yml

framework:
    ...
    session:
        handler_id:     %session_handler_id%   # read from parameters.yml
        #handler_id: session.handler.pdo       # use service defined later
        
        
        
parameters:
    # PARAMETERS FOR PDO SESSION MANAGEMENT
    pdo.db_options:
        db_table:    session
        db_id_col:   session_id
        db_data_col: session_value
        db_time_col: session_time

services:
    # PDO SESSION MANAGEMENT SERVICE CONFIGURATION        
    pdo:
        class: PDO
        arguments:
            dsn:      "mysql:dbname=%database_name%;host=%database_host%"
            user:     %database_user%
            password: %database_password%
        calls:
            - [setAttribute, [3, 2]] # \PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION

    session.handler.pdo:
        class:     Symfony\Component\HttpFoundation\Session\Storage\Handler\PdoSessionHandler
        arguments: ["@pdo", %pdo.db_options%]

parameters.yml

# app/config/parameters.yml

session_memcache_host: localhost
session_memcache_port: 11211
session_memcache_prefix: sess
session_memcache_expire: 3600
session_handler_id: null # which session handler to use. null = use php; ignores previous parameters
#session_handler_id: session.handler.pdo        # use PDO
#session_handler_id: session.handler.memcache   # use memcache