PHP Manual
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XXIII. Direct IO functions

Direct I/O Functions

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,..).

Installation

To get these functions to work, you have to configure PHP with --enable-dio.

Table of Contents
dio_open --  Opens a new filename with specified permissions of flags and creation permissions of mode
dio_read --  Reads n bytes from fd and returns them, if n is not specified, reads 1k block
dio_write --  Writes data to fd with optional truncation at length
dio_truncate --  Truncates file descriptor fd to offset bytes
dio_stat --  Gets stat information about the file descriptor fd
dio_seek -- Seeks to pos on fd from whence
dio_fcntl -- Performs a c library fcntl on fd
dio_close -- Closes the file descriptor given by fd
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