CLVII. Unicode Functions

简介

Unicode Support.

警告

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

需求

ICU 3.4 or later is required.

安装

First you should download and install ICU:
例子 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.

运行时配置

这些函数的行为受 php.ini 的影响。

表格 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_PERDIR	Available since PHP 6.0.0.

有关 PHP_INI_* 常量进一步的细节与定义参见附录 G。

以下是配置选项的简要解释。

unicode.output_encoding string: Default encoding for output.

预定义常量

以下常量由本扩展模块定义，因此只有在本扩展模块被编译到 PHP 中，或者在运行时被动态加载后才有效。

表格 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

目录
i18n_loc_get_default -- Get the default Locale
i18n_loc_set_default -- Set the default Locale
unicode_encode -- Takes a unicode string and converts it to a string in the specified encoding
unicode_semantics -- Check whether unicode semantics is enabled