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.