When you use & at the end, command is started in background. You can see background processes by command
jobs. When you try it, you can see php process in 'stopped' state.
Problem is that php is waiting for input. It is caused by this php extension:
Run it this way:
php -c /etc/php5/apache2/php.ini /var/www/module/test/autostart/start.php 12 < /dev/null &
or disable that extension.