下面開啟我們多語言的開發之旅：
建立pot檔案，pot是Portable Object Template的首字母縮寫，與po對應的是mo，mo是Machine Object的首字母縮寫。前者意指原始的字串檔案，一般用於給翻譯人員去修改的，後者則是與機器相關的，一般是供程式讀取。可以手工建立pot檔案，也可以通過xgettext從代碼中抽取字串來產生。這裡是用xgettext來產生的：
xgettext -a home.php -o home.pot
運行該命令後，我們發現，在目前的目錄下，產生了一個名home.pot的檔案，開啟該檔案，可以看到： 複製代碼 代碼如下:# SOME DESCRIPTIVE TITLE.
# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
# This file is distributed under the same license as the PACKAGE package.
# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
#
#, fuzzy
msgid ""
msgstr ""
"Project-Id-Version: PACKAGE VERSION\n"
"Report-Msgid-Bugs-To: \n"
"POT-Creation-Date: 2009-07-23 20:56+0800\n"
"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
"Language-Team: LANGUAGE <LL@li.org>\n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=CHARSET\n"
"Content-Transfer-Encoding: 8bit\n"
#: home.php:2
msgid "home"
msgstr "
根據pot產生不同語言的po檔案，這裡我們先產生一個簡體中文的po檔案：
export LANG=zh_CN.gb2312
msginit -l zh_CN.gb2312 -i home.pot
運行該命令後，我們發現，在目前的目錄下，產生了一個名zh_CN.po的檔案，開啟該檔案，可以看到： 複製代碼 代碼如下:# Chinese translations for PACKAGE package
# PACKAGE 軟體包的簡體中文翻譯.
# Copyright (C) 2009 THE PACKAGE'S COPYRIGHT HOLDER
# This file is distributed under the same license as the PACKAGE package.
# <huixinchen@localhost.localdomain>, 2009.
#
msgid ""
msgstr ""
"Project-Id-Version: PACKAGE VERSION\n"
"Report-Msgid-Bugs-To: \n"
"POT-Creation-Date: 2009-07-23 20:56+0800\n"
"PO-Revision-Date: 2009-07-23 21:00+0800\n"
"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
"Language-Team: Chinese\n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=GB2312\n"
"Content-Transfer-Encoding: 8bit\n"
#: test.php:2
msgid "home"
msgstr "
翻譯zh_CN.po裡對應的字串為中文： 複製代碼 代碼如下:# Chinese translations for PACKAGE package
# PACKAGE 軟體包的簡體中文翻譯.
# Copyright (C) 2009 THE PACKAGE'S COPYRIGHT HOLDER
# This file is distributed under the same license as the PACKAGE package.
# <huixinchen@localhost.localdomain>, 2009.
#
msgid ""
msgstr ""
"Project-Id-Version: PACKAGE VERSION\n"
"Report-Msgid-Bugs-To: \n"
"POT-Creation-Date: 2009-07-23 20:56+0800\n"
"PO-Revision-Date: 2009-07-23 21:00+0800\n"
"Last-Translator: <huixinchen@localhost.localdomain>\n"
"Language-Team: Chinese\n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=GB2312\n"
"Content-Transfer-Encoding: 8bit\n"
#: test.php:2
msgid "home"
msgstr "首頁
根據po檔案產生mo檔案。
msgfmt zh_CN.po -o zh_CN.mo
運行該命令後，我們發現，在目前的目錄下，產生了一個名zh_CN.mo的檔案。它是二進位的，不能用文字編輯器開啟。
安裝mo檔案到特定目錄中：
cp -f zh_CN.mo .local/LC_MESSAGES/home.mo
修改程式。 複製代碼 代碼如下:setlocale(LC_ALL, 'zh_CN');
// Specify location of translation tables
bindtextdomain("home", ".");
// Choose domain
textdomain("home");
// Translation is looking for in ./locale/zh_CN/LC_MESSAGES/home.mo now
$str = gettext('home'); //也可以使用_('home')
print <<<HTML
<a href="#">{$str}</a>
HTML;
運行這個指令碼, 看看, 是不是輸出正確的中文了呢?
添加其它語言也很容易，不需要修改程式，只需要像對待中文一樣，產生一個mo檔案，並安裝到系統中對應的目錄即可。切換不同的語言僅僅是修改當前的locale就行了。
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