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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

No external libraries are needed to build this extension.

# Installation

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

# Runtime Configuration

This extension has no configuration directives defined in `php.ini`.

# Resource Types

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

# Predefined Constants

This extension has no constants defined.

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