php调用c++程序无法写日志文件
请教，我用php的system函数调用一个c程序，这个c 程序会写一个日志文件，但是我在客户端用浏览器访问该php页面时，发现没有文件输出，而在服务器端独立运行c程序就会写文件了，请问这是怎么一回事？
大致情况如此：我的服务器是Redhat Enterprise Linux
php中这样调用c程序
system("/search/demo");
这个叫做demo的的程序是由demo.cpp编译生成而来的
demo.cpp 中有以下语句用来输出文件
ofstream fou("/var/www/html/demo.log"，ofstream::app);
foufou.close();
当我在命令行中执行/search/demo，程序运行，有文本输出，而我用浏览器访问php页面时，程序依旧执行，就是文件没有输出，请问这个是怎么回事？
------解决方案--------------------
这种问题都是权限问题，看看/var/www/html/demo.log是不是Everyone可读写
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