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PHP Manual

## 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.

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.

Installation
Resource Types
Installing/Configuring
PHP Manual