PHP supports the direct io functions as described in the Posix Standard (Section 6) for performing I/O functions at a lower level than the C-Language stream I/O functions (fopen(), fread(),..). The use of the DIO functions should be considered only when direct control of a device is needed. In all other cases, the standard filesystem functions are more than adequate.
注: 该扩展模块不适用于 Windows 平台！
无需外部库文件就可以加入本扩展模块的支持。
To get these functions to work, you have to configure PHP with --enable-dio.
该扩展模块未定义任何设置指令。
One resource type is defined by this extension: a file descriptor returned by dio_open().
该扩展模块未定义任何常量。