it safe mode

It is safe, since — as the name "single-user mode" suggests — only the superuser is able to access the system.

这样是安全的——就像它的名字“单一用户模式”的含意一样——只有超级用户可以访问系统。

Use of PHP's safe mode is one technique for meeting this goal, but it can also unduly limit users, and some PHP applications simply don't function with this facility enabled.

使用PHP的安全模式是实现这一目标的一种技术，但是它也过度地限制了用户，而且启用了这个设施之后，一些PHP应用程序就不能发挥作用。

While that process is not absolutely required, it ensures a safe mode upon the program's completion. Listing 3 shows a typical pattern for changing display modes.

虽然该过程不是绝对必需的，但它可以确保在程序完成时有一个安全的方式。