无法在php系统中运行Windows net.exe（）

I have PHP v5.3.28 setup up in Internet Information Server on WIndows Server 2008. I need to run a NET VIEW command from within my index.php file and display the output. I have not found any way to make this happen. I have been trying with system(), exec(), putting it into a .cmd file and executing that using code similar to that shown below. Nothing comes out, nothing returned. I can run other simple commands such as an xcopy, but using NET.exe does not seem to work at all.

echo "<pre>";
$str=system('C:\Windows\system32\NET1.exe VIEW \\tpptra01',$rtn); 
$str=system('D:\tmp\tpptra01\cpdbfiles.bat',$rtn);
$str=exec('C:\Windows\system32\NET1.exe VIEW \\tpptra01');
echo "</pre>";

Any suggestions would be greatly appreciated, I'm at a loss.

Try this,

echo "<pre>";
echo shell_exec("C:\Windows\system32\NET1.exe VIEW \\tpptra01");  
echo shell_exec("D:\tmp\tpptra01\cpdbfiles.bat");
echo shell_exec("C:\Windows\system32\NET1.exe VIEW \\tpptra01");
echo "</pre>";