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_* modes, see the Where a configuration setting may be set.

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.