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# LXXXVII. GNU Recode functions

# Introduction

This module contains an interface to the GNU Recode library, version 3.5. The GNU Recode library converts files between various coded character sets and surface encodings. When this cannot be achieved exactly, it may get rid of the offending characters or fall back on approximations. The library recognises or produces nearly 150 different character sets and is able to convert files between almost any pair. Most RFC 1345 character sets are supported.

# Requirements

You must have GNU Recode 3.5 or higher installed on your system. You can download the package from here.

# Installation

To be able to use the functions defined in this module you must compile your PHP interpreter using the `--with-recode[=DIR]` option.

Warning
Crashes and startup problems of `PHP` may be encountered when loading the recode as extension after loading any extension of mysql or imap. Loading the recode before those extension has proven to fix the problem. This is due a technical problem that both the c-client library used by imap and recode have their own `hash_lookup()` function and both mysql and recode have their own `hash_insert` function.

# Runtime Configuration

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

# Resource Types

This extension has no resource types defined.

# Predefined Constants

This extension has no constants defined.

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