注意，程序的名字只是命令行值的第0个参数——不要相信程序名，因为攻击者会改变它。
Note that the name of the program is just argument number 0 in the command line values — don't trust the program name, since an attacker can change it.
在很多类unix系统上，命令行值和环境可以被其他用户看到，所以不是在进程间保密地发送数据的好办法。
On many UNIX-like systems, the command-line values and environment variable values can be viewed by other users, so they aren't a good way to privately send data between processes.
为了查看使用命令行调试的值，让我们从下面所示的非常非常糟糕的PHP文件开始。
To see the value of debugging using the command line, let's start with the really, really bad PHP file shown below.
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