php exec：不返回输出

I was having trouble using the PHP exec command to execute any batch
file. Executing other commands (i.e.,“dir”) works fine). But if I
executed a batch file,I receieved no output from the exec command.

The server setup I have consists of Windows Server 2003 server running
IIS6 and PHP 5.2.3. On this server,I have:

1. Granted execute permissions to the Internet User on c:windowssystem32cmd.exe.
2. Granted Everyone->Full Control to the directory in which the batch file is written.
3. Granted Everyone->Full Control on the entire c:cygwinbin directory and its contents.
4. Granted the Internet User “log on as batch” permissions.
5. Specified the full path to each file being executed.
6. Tested these scripts running from the command line on the server and they work just fine.
7. Ensured that %systemroot%system32 is in the system path.

It turns out that even with all of the above in place on the server,I
had to specify the full path to cmd.exe in the exec call.

When I used the call: $output = exec("c:windowssystem32cmd.exe
/c $batchFileToRun");

then everything worked fine. In my situation,$batchFileToRun was the
actual system path to the batch file (i.e.,the result of a call to
realpath()).

exec和shell_exec手册页上还有更多的内容.也许跟随他们将会得到它并为你工作.