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. PHP <= 5.6.0 uses "ISO-8859-1" as default. Since PHP 5.6.0, if this setting is empty, default_charset is used.
iconv.output_encoding	""	PHP_INI_ALL	Available since PHP 4.0.5. PHP <= 5.6.0 uses "ISO-8859-1" as default. Since PHP 5.6.0, if this setting is empty, default_charset is used.
iconv.internal_encoding	""	PHP_INI_ALL	Available since PHP 4.0.5. PHP <= 5.6.0 uses "ISO-8859-1" as default. Since PHP 5.6.0, if this setting is empty, default_charset is used.

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.