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# XXIX. Directory Functions

# Introduction

# Requirements

No external libraries are needed to build this extension.

# Installation

There is no installation needed to use these functions; they are part of the PHP core.

# Runtime Configuration

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

# Resource Types

# Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

`DIRECTORY_SEPARATOR` (string)

`PATH_SEPARATOR` (string)

> Note: The `PATH_SEPARATOR` was introduced with PHP 4.3.0-RC2.

# See Also

For related functions such as dirname(), is_dir(), mkdir(), and rmdir(), see the Filesystem section.

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