NIS (formerly called Yellow Pages) allows network management of important administrative files (e.g. the password file). For more information refer to the NIS manpage and The Linux NIS(YP)/NYS/NIS+ HOWTO. There is also a book called Managing NFS and NIS by Hal Stern.
注: 本扩展已被移动到 PECL 库中且自以下版本起不再被绑定到 PHP 中：5.1.0.
注: 本扩展模块在 Windows 平台下不可用。
None besides functions from standard Unix libraries which are always available (either libc or libnsl, configure will detect which one to use).
To get these functions to work, you have to configure PHP with --enable-yp.
本扩展模块在 php.ini 中未定义任何配置选项。
以下常量由本扩展模块定义，因此只有在本扩展模块被编译到 PHP 中，或者在运行时被动态加载后才有效。