lib/ezsession/classes/ezpsessionhandlersymfony.php
public function sessionStart()
    {
        if ( $this->storage && !$this->storage->isStarted() )
        {
            $this->storage->start();
        }

        return true;
    }
public function sessionStart()
    {
        if ( $this->storage && !$this->storage->isStarted() )
        {
            $this->storage->start();
        }

        return true;
    }
public function sessionStart ( ) { if ( $ this -> storage && ! $ this -> storage -> isStarted ( ) ) { $ this -> storage -> start ( ) ; } return true ; }
Let Symfony starts the session

@return bool
Let Symfony starts the session