CI框架 -- 核心文件 之 Lang.php（加载语言包）

<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class CI_Lang {

var $language    = array();

var $is_loaded    = array();

function __construct()
{
log_message('debug', "Language Class Initialized");
}

//加载语言包
function load($langfile = '', $idiom = '', $return = FALSE, $add_suffix = TRUE, $alt_path = '')
{
$langfile = str_replace('.php', '', $langfile);

if ($add_suffix == TRUE)
{
$langfile = str_replace('_lang.', '', $langfile).'_lang';
}

$langfile .= '.php';

if (in_array($langfile, $this->is_loaded, TRUE))
{
return;
}

$config =& get_config();

if ($idiom == '')
{
$deft_lang = ( ! isset($config['language'])) ? 'english' : $config['language'];
$idiom = ($deft_lang == '') ? 'english' : $deft_lang;
}

// Determine where the language file is and load it
if ($alt_path != '' && file_exists($alt_path.'language/'.$idiom.'/'.$langfile))
{
include($alt_path.'language/'.$idiom.'/'.$langfile);
}
else
{
$found = FALSE;

foreach (get_instance()->load->get_package_paths(TRUE) as $package_path)
{
if (file_exists($package_path.'language/'.$idiom.'/'.$langfile))
{
include($package_path.'language/'.$idiom.'/'.$langfile);
$found = TRUE;
break;
}
}

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

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

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

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

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

//从language数组中取出一条数据
function line($line = '')
{
$value = ($line == '' OR ! isset($this->language[$line])) ? FALSE : $this->language[$line];

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

return $value;
}

}