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XXIII. Direct IO functions

Introduction

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,..).

Requirements

These functions are available as part of the standard module, which is always available.

Installation

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

Runtime Configuration

This extension does not define any configuration directives.

Resource Types

One resource type is defined by this extension: a file descriptor returnded by dio_open().

Predefined Constants

This extension does not define any constants.

Table of Contents
dio_close -- Closes the file descriptor given by fd
dio_fcntl -- Performs a c library fcntl on fd
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_seek -- Seeks to pos on fd from whence
dio_stat --  Gets stat information about the file descriptor fd
dio_truncate --  Truncates file descriptor fd to offset bytes
dio_write --  Writes data to fd with optional truncation at length
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