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PHP Manual

## Runtime Configuration

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

Iconv Configure Options
Name | Default | Changeable | Changelog
--- | --- | --- | ---
iconv.input_encoding | "" | PHP_INI_ALL | Available since PHP 4.0.5. Deprecated in PHP 5.6.0.
iconv.output_encoding | "" | PHP_INI_ALL | Available since PHP 4.0.5. Deprecated in PHP 5.6.0.
iconv.internal_encoding | "" | PHP_INI_ALL | Available since PHP 4.0.5. Deprecated in PHP 5.6.0.

Here's a short explanation of the configuration 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.

`iconv.input_encoding` string
  Warning

  This feature has been DEPRECATED as of PHP 5.6.0. Relying on this feature is highly discouraged.

  PHP 5.6 and later users should leave this empty and set `default_charset` instead.

`iconv.output_encoding` string
  Warning

  This feature has been DEPRECATED as of PHP 5.6.0. Relying on this feature is highly discouraged.

  PHP 5.6 and later users should leave this empty and set `default_charset` instead.

`iconv.internal_encoding` string
  Warning

  This feature has been DEPRECATED as of PHP 5.6.0. Relying on this feature is highly discouraged.

  PHP 5.6 and later users should leave this empty and set `default_charset` instead.

Installation
Resource Types
Installing/Configuring
PHP Manual