php如何调用cmd命令登录并复制共享文件夹

Question

//先登录$cmd='net use \\\\192.168.1.255\\e$\\dtcms\\dmeo "password" /user:"administrator" /persistent:"YES"';exec($cmd);//再复制$cmd1='xcopy \\\\192.168.1.255\\e$\\dtcms\\dmeo E:\\work\\notfinish\\demo /D/E';exec($cmd1);已确定在cmd命令上是可以执行的。但是php运行时却没效果且安全模式已关闭。 如果命令中需要加入php变量，比如：$path=demo1.txt;$cmd1='xcopy \\\\192.168.1.255\\e$\\dtcms\\dmeo\\$path E:\\work\\notfinish\\demo /D/E';该怎么连接字符串和变量