Dealing with mass import in doctrine/pdo using pcntl_fork

import

<?php

class importTask extends sfTask
{
    protected function execute($arguments = array(), $options = array())
    {
        $xml = simplexml_load_file('file');
        $users = array();
        foreach ($xml->users as $user)
        {
            $users[] = $user;

            if (count($users) < 10) // number of xml "users" you wanna put in each fork wagon
            {
                continue;
            }

            $pid = pcntl_fork();
            if ($pid == -1)
            {
                die('could not fork, you need pcntl extension');
            }
            elseif ($pid)
            {
                pcntl_wait($status);
                pcntl_waitpid($pid, $stat);

                // we finished to process last wagon, let's prepare a new one
                $users = array();
            }
            else
            {
                try
                {
                    $this->processForking($users);
                    posix_kill(getmypid(), 9);
                } catch (Exception $e)
                {
                    posix_kill(getmypid(), 9);
                }
            }

        }
        // last users without fork
        $this->processForking($users);

    }

    protected function processForking($users)
    {
        foreach ($users as $userXml)
        {
            $userNew = new User();
            $userNew->fromArray($userXml); // or whatever
            $userNew->save();
            $userNew->free(true);
        }
    }
}