CodeIgniter.php 引入的第九个核心文件($LANG)。语言类提供了一些方法用于获取语言文件和不同语言的文本来实现国际化。

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<?php
/**
* CodeIgniter
*
* An open source application development framework for PHP
*
* This content is released under the MIT License (MIT)
*
* Copyright (c) 2014 - 2015, British Columbia Institute of Technology
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @package CodeIgniter
* @author EllisLab Dev Team
* @copyright Copyright (c) 2008 - 2014, EllisLab, Inc. (http://ellislab.com/)
* @copyright Copyright (c) 2014 - 2015, British Columbia Institute of Technology (http://bcit.ca/)
* @license http://opensource.org/licenses/MIT MIT License
* @link http://codeigniter.com
* @since Version 1.0.0
* @filesource
*/
defined('BASEPATH') OR exit('No direct script access allowed');

/**
* Language Class
*
* @package CodeIgniter
* @subpackage Libraries
* @category Language
* @author EllisLab Dev Team
* @link http://codeigniter.com/user_guide/libraries/language.html
*/
class CI_Lang {

/**
* List of translations
*
* @var array
*/
public $language = array();

/**
* List of loaded language files
*
* @var array
*/
public $is_loaded = array();

/**
* Class constructor
*
* @return void
*/
public function __construct()
{
log_message('info', 'Language Class Initialized');
}

// --------------------------------------------------------------------

/**
* Load a language file
*
* @param mixed $langfile Language file name
* @param string $idiom Language name (english, etc.)
* @param bool $return Whether to return the loaded array of translations
* @param bool $add_suffix Whether to add suffix to $langfile
* @param string $alt_path Alternative path to look for the language file
*
* @return void|string[] Array containing translations, if $return is set to TRUE
*/
public function load($langfile, $idiom = '', $return = FALSE, $add_suffix = TRUE, $alt_path = '')
{
// 支持批量引入
if (is_array($langfile))
{
foreach ($langfile as $value)
{
$this->load($value, $idiom, $return, $add_suffix, $alt_path);
}

return;
}

//去除后缀
$langfile = str_replace('.php', '', $langfile);

//增加指定后缀
if ($add_suffix === TRUE)
{
$langfile = preg_replace('/_lang$/', '', $langfile).'_lang';
}

$langfile .= '.php';

// 获取语种
if (empty($idiom) OR ! preg_match('/^[a-z_-]+$/i', $idiom))
{
$config =& get_config();
$idiom = empty($config['language']) ? 'english' : $config['language'];
}

if ($return === FALSE && isset($this->is_loaded[$langfile]) && $this->is_loaded[$langfile] === $idiom)
{
return;
}

// Load the base file, so any others found can override it
$basepath = BASEPATH.'language/'.$idiom.'/'.$langfile;
if (($found = file_exists($basepath)) === TRUE)
{
include($basepath);
}

// 额外路径
// Do we have an alternative path to look in?
if ($alt_path !== '')
{
$alt_path .= 'language/'.$idiom.'/'.$langfile;
if (file_exists($alt_path))
{
include($alt_path);
$found = TRUE;
}
}
else
{
foreach (get_instance()->load->get_package_paths(TRUE) as $package_path)
{
$package_path .= 'language/'.$idiom.'/'.$langfile;
if ($basepath !== $package_path && file_exists($package_path))
{
include($package_path);
$found = TRUE;
break;
}
}
}

if ($found !== TRUE)
{
show_error('Unable to load the requested language file: language/'.$idiom.'/'.$langfile);
}

if ( ! isset($lang) OR ! is_array($lang))
{
log_message('error', 'Language file contains no data: language/'.$idiom.'/'.$langfile);

if ($return === TRUE)
{
return array();
}
return;
}

if ($return === TRUE)
{
return $lang;
}

//保存
$this->is_loaded[$langfile] = $idiom;
$this->language = array_merge($this->language, $lang);

log_message('info', 'Language file loaded: language/'.$idiom.'/'.$langfile);
return TRUE;
}

// --------------------------------------------------------------------

/**
* Language line
* 获取指定item
*
* Fetches a single line of text from the language array
*
* @param string $line Language line key
* @param bool $log_errors Whether to log an error message if the line is not found
* @return string Translation
*/
public function line($line, $log_errors = TRUE)
{
$value = isset($this->language[$line]) ? $this->language[$line] : FALSE;

// Because killer robots like unicorns!
if ($value === FALSE && $log_errors === TRUE)
{
log_message('error', 'Could not find the language line "'.$line.'"');
}

return $value;
}

}