开始php脚本的符号

I re-installed and upgrade my ubuntu version from Ubuntu 13.04 to 13.10 then I installed apache2 and php. The problem is that I have php scripts that begins with <? but now these scripts only work if I change <? to <?php. How can I make that php work with <??

You need to set the option short_open_tag to 1 (true) in your php.ini and it should work fine.