PHP Manual

Introduction

Unicode Support.

Warning

This extension is still in development and it isn't available to public yet.

Requirements

ICU 3.4 or later is required.

Installation

First you should download and install ICU:

Example 1. install ICU on Unix

./configure --disable-threads --enable-extras --enable-icuio --enable-layout
make && make install

Then checkout latest PHP and configure it --with-icu-dir=<dir> option, where <dir> was the dir to where you installed ICU. You don't need to explicitly use this option if you install ICU to a standard location.

Runtime Configuration

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

Table 1. 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	off	PHP_INI_SYSTEM	Available since PHP 6.0.0.

For further details and definitions of the PHP_INI_* constants, see the Appendix I.

Here's a short explanation of the configuration directives.

unicode.output_encoding string: Default encoding for output.

Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

Table 2.

constant	value	description
U_INVALID_STOP	0	stop at first invalid character
U_INVALID_SKIP	1	skip invalid characters
U_INVALID_SUBSTITUTE	2	replace invalid characters
U_INVALID_ESCAPE	3	escape invalid characters

Table of Contents
unicode_encode -- Set encoding of a unicode string
unicode_semantics -- Check whether unicode semantics is enabled

CLXVIII. Unicode Functions

Introduction

Requirements

Installation

Runtime Configuration

Predefined Constants