Runtime Configuration

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

Unicode Configuration Options

Name	Default	Changeable	Changelog
unicode.fallback_encoding	NULL	PHP_INI_ALL	Available since PHP 6.0.0.
unicode.from_error_mode	"2"	PHP_INI_ALL	Available since PHP 6.0.0.
unicode.from_error_subst_char	"3f"	PHP_INI_ALL	Available since PHP 6.0.0.
unicode.http_input_encoding	NULL	PHP_INI_ALL	Available since PHP 6.0.0.
unicode.output_encoding	NULL	PHP_INI_ALL	Available since PHP 6.0.0.
unicode.runtime_encoding	NULL	PHP_INI_ALL	Available since PHP 6.0.0.
unicode.script_encoding	NULL	PHP_INI_ALL	Available since PHP 6.0.0.
unicode.semantics	"0"	PHP_INI_SYSTEM	Available since PHP 6.0.0.

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

Here's a short explanation of the configuration directives.

unicode.output_encoding string

Default encoding for output.