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PHP Manual

## Runtime Configuration

The behaviour of these functions is affected by settings in php.ini.

Iconv configuration options
Name | Default | Changeable | Changelog
--- | --- | --- | ---
iconv.input_encoding | "ISO-8859-1" | PHP_INI_ALL | Available since PHP 4.0.5.
iconv.output_encoding | "ISO-8859-1" | PHP_INI_ALL | Available since PHP 4.0.5.
iconv.internal_encoding | "ISO-8859-1" | PHP_INI_ALL | Available since PHP 4.0.5.

For further details and definitions of the PHP_INI_* constants, see the php.ini directives.
Warning

Some systems (like IBM AIX) use "ISO8859-1" instead of "ISO-8859-1" so this value has to be used in configuration options and function parameters.

> Note: Configuration option `iconv.input_encoding` is currently not used for anything.

Installation
Resource Types
Installing/Configuring
PHP Manual